[[1]. Karastoyanov, S., Nature and Significance of Political Regionalistics, Annual book of the “St. Climent Ohridsky” University of Sofia, Faculty of Geology and Geography, Book 2 - Geography, vol. 103, pg. 19-32.]Search in Google Scholar
[[2]. Dimov, N., Zoning, Socio-economic Regions and Regional Development of Bulgaria. Publishing house EKS-PRES, S. 2012, pg. 6-25.]Search in Google Scholar
[[3]. Dermendzhieva, S., Methods of Research Work in Regional Geography. University publishing house “St. Cyril and St. Methodius”, V. Tarnovo. 2001, 328 pages.]Search in Google Scholar
[[4]. Dermendzhieva, S.; and others, Geography and Education. Methods of the Education in Geography, part I. University publishing house “St. Cyril and St. Methodius”, V. Tarnovo. 2010, 400 pages.]Search in Google Scholar
[[5]. Dermendzhieva, S., The Geoecology-Regional Studies Interrelation in the Education in Geography - Aspects of the Didactic Communication, Proceeding of the “Angel Kanchev” University of Ruse, vol. 40, series 9, Ruse. 2003, pg. 20-23.]Search in Google Scholar
