[Ascard J., Håkansson B., Hansson A., Stridh H., Söderlind M. 2010. Cost price calculation for organically and conventionally grown apples in Sweden, SLU Alnarp, 2010 Online at: http://www.ecofruit.net/2010/46_RP_J _Ascard_B_Hakansson_A_Hansson- _et_al_S304bis312.pdf.]Search in Google Scholar
[Brzozowski P., Zmarlicki K. 2010. Economics of organic apple and strawberry production in Poland in the years 2007-2009. J. FRUIT ORNAM. PLANT RES. 18(2): 255-264.]Search in Google Scholar
[Firth Ch. 2005. Economics of organic top fruit production (OF0305). The Initiative on Organic Research (IOR), Henry Doubleday Research Association (HDRA). Online http://www2.defra.gov.uk/research/project_data/More.asp?I=OF0305&SCOPE=0&M=PSA&V=EP%3A200.]Search in Google Scholar
[Gianessi L., Williams A. 2011. European organic apple production demonstrates the value of pesticides. International pesticide Benefits Case Study No.44. CropLife Fundation. Crop Protection Research Institute.]Search in Google Scholar
[Jönsson Å.H. 2007. Organic apple production in Sweden: cultivation and cultivars. Swedish University of Agricultural Sciences, Balsgård, Thesis (Ph.D.), 33p.]Search in Google Scholar
[Peck G.M., Andrews P.K., Reganold J.P., Fellman J.K. 2006. Apple orchard productivity and fruit quality under organic, conventional, and integrated management. HORTSCIENCE 41: 99-107.]Search in Google Scholar
[Weibel F.P., Häseli A., Schmid O., Willer H. 2004. Present status of organic fruit growing in Europe, ISHS: XXVI International Horticultural Congress: Sustainability of Horticultural Systems in the 21st Century, ACTA HORTIC. 638: 375-385.]Search in Google Scholar
[http://www.agro.basf.com/agr/AP-Internet-/en/content/sustainability/eco-efficiencyanalysis/case-study-organic-applescompared-to-conventional]Search in Google Scholar
[http://www.scribd.com/doc/47829728/ADetailed-Analysis-of-US-Organic-Crops ]Search in Google Scholar