[Abdulwali, H. A., Alshmrani, S. M., & Almufti, A. N. (2017). Secondary school science teachers’ views about their reflective practices. Journal of Teacher Education for Sustainablity, 19(1), 45–53. doi: 10.2478/jtes-2014-0005.10.2478/jtes-2014-0005]Open DOISearch in Google Scholar
[Alampei, I., Malotidi, V., Psallidas, V., & Scoullos, M. (2013). Key concepts in Education for Sustainable Development (ESD). In Education for Sustainable Development in Biosphere Reserves and other Designated Areas A Resource Book for Educators in South-Eastern Europe and the Mediterranean. UNESCO.]Search in Google Scholar
[Bell, J. (2010). Doing your research project. A guide for first-time research. Bershire: McGraw-Hill International.]Search in Google Scholar
[Biasutti, M., De Baz, T., & Alshawa, H. (2016). Assessing the infusion of sustainable principles into university curriculum. Journal of Teacher Education for Sustainability, 18(2), 21–40. doi: 10.1515/jtes-2016-0012.10.1515/jtes-2016-0012]Open DOISearch in Google Scholar
[Borg, C., Gericke, N., Höglund, H. O., & Bergman, E. (2014). Subject-and experience-bound differences in teachers’ conceptual understanding of sustainable development. Environmental Education Research, 20(4), 526–551.10.1080/13504622.2013.833584]Search in Google Scholar
[Burton, N., Brundrett, M., & Jones, M. (2008). Doing your educational research project. London: Sage.]Search in Google Scholar
[Cantrell, D. C. (1993). Alternative paradigms in environmental education research: The interpretive perspective. Alternative Paradigms in Environmental Education Research, 8, 81–104.]Search in Google Scholar
[Carban, E., & Fisher, D. 2017. Sustainability reporting at schools: challenges and benefits. Journal of Teacher Education for Sustainability, 19(1), 69–81. doi: 10.1515/jtes-2017-0005.10.1515/jtes-2017-0005]Open DOISearch in Google Scholar
[Cohen, L., Manion, L., & Morrison, K. (2011). Research methods in education. (7th Ed.). London: Routledge.]Search in Google Scholar
[Corney, G. (2006). Education for sustainable development: An empirical study of the tensions and challenges faced by geography student teachers. International Research in Geographical and Environmental Education, 15(3), 224–240.10.2167/irgee194.0]Search in Google Scholar
[Corney, G., & Reid, A. (2007). Student teachers’ learning about subject matter and pedagogy in education for sustainable development. Environmental Education Research, 13(1), 33–54.10.1080/13504620601122632]Search in Google Scholar
[Creswell, J. (2009). Research design: Quantitative, qualitative, and mixed methods approaches (3rd Ed.). Los Angeles: Sage.]Search in Google Scholar
[Denzin, N., & Lincoln, Y. (2008). Collecting and interpreting qualitative materials (Vol. 3). Thousand Oaks: Sage.]Search in Google Scholar
[Dimenäs, J. & Alexandersson, M. (2012). Crossing disciplinary borders: perspectives on learning about sustainable development. Journal of Teacher Education for Sustainability, 14(1), 5–19. doi: 10.2478/v10099-012-0001-0.10.2478/v10099-012-0001-0]Open DOISearch in Google Scholar
[Dube, C. (2012). Implementing education for sustainable development: The role of Geography in South African secondary schools. PhD dissertation, Stellenbosch University.]Search in Google Scholar
[Egne, R. M. (2014). Representations of the Ethiopian multicultural society in secondary teacher education curricula. Journal of Teacher Education for Sustainability, 16(1), 54–75. doi: 10.2478/jtes-2014-0003.10.2478/jtes-2014-0003]Open DOISearch in Google Scholar
[Flick, U. (2007). Designing qualitative research: The sage qualitative research kit. Thousand Oaks, CA: Sage.10.4135/9781849208826]Search in Google Scholar
[Fraser, J., Gupta, R., & Krasny, M.E. (2015). Practitioners’ perspectives on the purpose of environmental education. Environmental Education Research, 21(5), 777–800.10.1080/13504622.2014.933777]Search in Google Scholar
[Gayford, C. (2003). Learning for sustainability: from the pupils perspective. Retrieved December 3, 2017, from http://www.se-ed.co.uk/sites/default/files/resources/WWF%20Learning_for_sustainability.pdf]Search in Google Scholar
[van Gejeka, N. (2013). Research into learning process in a vocational secondary school in the context of sustainable development. Journal of Teacher Education for Sustainability, 15(2), 67–77. doi: 10.2478/jtes-2013-0012.10.2478/jtes-2013-0012]Open DOISearch in Google Scholar
[Green, M., & Somerville, M. (2015). Sustainability education: researching practice in primary schools. Environmental Education Research, 21(6), 832–845.10.1080/13504622.2014.923382]Search in Google Scholar
[Hartsell, B. (2006). Teaching toward compassion: Environmental values education for secondary students. The Journal of Secondary Gifted Education, 17, 265–271.10.4219/jsge-2006-406]Search in Google Scholar
[Huckle, J. (2006). Education for sustainable development: A briefing paper for the training and development agency for school. London: Earthscan.]Search in Google Scholar
[Hungerford, H. R. (2010). Environmental Education (EE) for 21st century: where have we been? Where are we now? Where are we headed? Journal of Environmental Education, 41(1), 1–6.10.1080/00958960903206773]Search in Google Scholar
[Iliško, D. H., Ignatjeva, S., & Mičule, I. (2011). Teacher-carried research as a tool for teachers’ professional growth. Journal of Teacher Education for Sustainability, 13 (2), 87–103. doi: 10.2478/v10099-011-0016-y.10.2478/v10099-011-0016-y]Open DOISearch in Google Scholar
[Jeronen, E., Palmberg, I., & Yli-Panula, E. (2017). Teaching methods in biology education and sustainability education including outdoor education for promoting sustainability – a literature review. Educational Sciences, 7(1). doi: 10.3390/educsci 7010001.10.3390/educsci7010001]Open DOISearch in Google Scholar
[Kabadayi, A. (2016). A suggested in-service training model based on Turkish preschool teachers, conceptions for sustainable development. Journal of Teacher Education for Sustainability, 18(1), 5–15. doi: 10.1515/jtse-2016-0001.10.1515/jtse-2016-0001]Open DOISearch in Google Scholar
[Kanyimba, A. T. (2002). Towards the incorporation of environmental education in the Namibian secondary school curriculum. Masters dissertation, University of South Africa.]Search in Google Scholar
[Kasanda, C., Lubben, F., Gaoseb, N., Kandjeo-Marenga, M., Kapenda, H., & Campbel, B. (2005). The role of everyday context in learner-centred teaching: The practice in Namibia secondary schools. International Journal of Science Education, 27, 1805–1823.10.1080/09500690500277854]Search in Google Scholar
[Ketlhoilwe, M. J. (2007). Genesis of environmental education policy in Botswana: construction and interpretation. Doctoral dissertation, Rhodes University.]Search in Google Scholar
[Ketlhoilwe, M. P. (2010). Education for sustainable development in higher education institutions in southern Africa. International Journal of Scientific Research in Education, 3(3), 141–150.]Search in Google Scholar
[Kimaryo, L. A. (2011). Integrating environmental education in primary school education in Tanzania: teachers perceptions and teaching practices. Åbo, Finland: Åbo Akademi University Press.]Search in Google Scholar
[Kostova, Z., & Atasoy, E. (2008). Methods of successful learning in environmental education. Journal of Theory and Practice in Education, 4(1), 49–78.]Search in Google Scholar
[Littledyke, M. (2008). Science education for environmental awareness: Approaches to integrating cognitive and affective domains. Environmental Education Research, 14 (1), 1–17.10.1080/13504620701843301]Search in Google Scholar
[Majumdar, S. (2012). Integrating sustainable development in TVET curriculum. In 11th UNESCO–APEID International Conference on “Reinventing Higher Education: Toward Participatory and Sustainable Development” Bangkok, Thailand.]Search in Google Scholar
[Mweti, I., & van Wyk, H. (2005). NSSC Development Studies. Module 2. Cambridge: Cambridge University Press.]Search in Google Scholar
[Namibia. Ministry of Basic Education, Sport and Culture. (1997). Broad Curriculum for Secondary Schools. Okahandja: NIED.]Search in Google Scholar
[Nigatu, T. (2009). Qualitative data analysis. Retrieved December 3, 2017, from http://www.slideshare.net/tilahunigatu/qualitative-data-analysis-11895136]Search in Google Scholar
[Ololube, N. P., Egbezor, D. E., & Kpolovie, P. J. (2008). Education policies and teacher education programs: Meeting the millennium development goals. Journal of Teacher Education for Sustainability, 9, 21–34. doi: 10.2478/v10099-009-0016-3.10.2478/v10099-009-0016-3]Open DOISearch in Google Scholar
[Olsson, D., Gericke, N., & Chang Rundgren, S.-N. (2016). The effect of implementation of education for sustainable development in Swedish compulsory schools – Assessing pupils’ sustainability consciousness. Environmental Education Research, 22(2), 176–202.10.1080/13504622.2015.1005057]Search in Google Scholar
[Ortega, J. L. G., & Fuentes, A. R. (2015). Communication skills training in trainee primary school teachers in Spain. Journal of Teacher Education for Sustainability, 17 (1), 86–98. doi: 10.1515/jtes-2015-0007.10.1515/jtes-2015-0007]Open DOISearch in Google Scholar
[Reid, A. (2002). Environmental change and sustainable education. In M. Smith (Ed.), Teaching geography in secondary schools (pp. 225–244). London: The Open University.]Search in Google Scholar
[Scott, S. (2008). Educational research: Quantitative and qualitative and mixed approaches. Boston: Allyn and Bacon.]Search in Google Scholar
[Scoullos, M. (2013). Education for sustainable development in biosphere reserves and other designated areas. A Resource book for educators in South-Eastern Europe and the Mediterranean. UNESCO.]Search in Google Scholar
[Simasiku, F. S. (2012). Investigating opportunities for the development of action competence through fieldwork in Namibia Senior Secondary school Geography curriculum. Master’s dissertation, Rhodes University.]Search in Google Scholar
[Spiropoulou, D., Antonakaki, T., Kontaxaki, S., & Bouras, S. (2007). Primary teachers’ literacy and attitudes on education for sustainable development. Journal of Science Education and Technology, 16, 443–450. doi: 10.1007/s10956-007-9061-7.10.1007/s10956-007-9061-7]Open DOISearch in Google Scholar
[Spork, H. (1992). Environmental education: A mismatch between theory and practice. Australian Journal of Environmental Education, 8, 147–66.10.1017/S0814062600003359]Search in Google Scholar
[Sterling. S. (2001). Sustainable education – Putting relationship back into education. Retrieved December 3, 2017, from http://ecommunitied.tafensw.edu.au]Search in Google Scholar
[Sund, L. (2016). Facing global sustainability issues: Teachers’ experiences of their own practices in environmental and sustainability education. Environmental Education Research, 22(6), 788–805.10.1080/13504622.2015.1110744]Search in Google Scholar
[Summers, M., Childs, A., & Corney, G. (2005). Education for sustainable development in initial teacher training: Issues for interdisciplinary collaboration. Environmental Education Research, 11(5), 623–647.10.1080/13504620500169841]Search in Google Scholar
[Uitto, A., & Saloranta, S. 2017. Subject teachers as educators for sustainability: A survey study. Education Sciencies, 7(8). doi: 10.3390/educsci7010008.10.3390/educsci7010008]Open DOISearch in Google Scholar
[UNESCO. (2009). UN Decade of Education for Sustainable Development (2005–2014). Retrieved December 3, 2017, from http://portal.unesco.org/education/en/ev.php-URL_ID=23279&URL_DO=DO_TOPIC&URL_SECTION=201.html]Search in Google Scholar
[Velazquez, L., Munguia, N., & Sanchez, M. (2005). Deterring sustainability in higher education institutions: An appraisal of the factors which influence sustainability in higher education institution. International Journal of Sustainability in Higher Education, 6(4), 383–391.10.1108/14676370510623865]Search in Google Scholar
[Wals, A., E. J. (2011). Learning our way to sustainability. Journal of Education for Sustainable Development, 5(2), 177–186.10.1177/097340821100500208]Search in Google Scholar
[Willis, G. B. (2007). Analysis of the cognitive interview in questionaire desing. Understanding qualitative research. Oxford: Oxford University Press.]Search in Google Scholar
[Yavetz, B., Goldman, D., & Pe’er, S. (2014). How do preservice teachers perceive ‘environment’ and its relevance to their area of teaching? Environmental Education Research, 20(3), 354–371.10.1080/13504622.2013.803038]Search in Google Scholar
[Yin, R. K. (2003). Case study research design and methods (6th Ed.). London: Sage.]Search in Google Scholar
[Yin, R. K. (2009). Case study research: Design and methods (4th Ed). Thousand Oaks: Sage. Retrieved December 3, 2017, from https://manyebooks.org/download/Yin-case-study-research.pdf]Search in Google Scholar
[Yin, R. K. (2012). Applications of case study research (3rd Ed.) Thousand Oaks: Sage.]Search in Google Scholar
[Zhang, Y., & Wildemuth, B. M. (2009). Qualitative analysis of content. Applications of social research methods to questions in information and library science, pp. 308–319.]Search in Google Scholar
