Arsić, Z. (2013) “DIDACTICAL-METHODICAL ASSUMPTIONS AND CONDITIONS FOR SUCCESSFUL SOLUTION OF ECOLOGICAL PROBLEMS AT PRESCHOOL INSTITUTIONS”, International Journal of Cognitive Research in Science, Engineering and Education (IJCRSEE), 1(1), pp. 76–86. Available at: https://ijcrsee.com/index.php/ijcrsee/article/view/54 (Accessed: 31 October 2025).