Koçak Tümer, N. Bilge. “Analysis of Postgraduate Theses Prepared for the Preschool Period on ‘Environmental Education’ Conducted Between 2011 and 2020 in Turkey: A Content Analysis”. Psycho-Educational Research Reviews 10, no. 3 (December 10, 2021): 30–43. Accessed May 4, 2025. https://www.perrjournal.com/index.php/perrjournal/article/view/10.