NAGORNIUK, Oksana, and Olga NAGORNIUK. “Basic Principles of Education for Sustainable Development and Their Role in Formation of Ecocentric Outlook”. Journal of Education, Technology and Computer Science 5, no. 1 (June 30, 2012): 217–222. Accessed December 5, 2025. https://journals.ur.edu.pl/jetacomps/article/view/6968.