Олійник, О.О. “Theoretical Approaches in the Study of Intelligence and Thinking Older Preschoolers”. Proceedings of Kyiv Aviation Institute. Series: Pedagogy. Psychology 2, no. 2 (September 6, 2012): 105. Accessed June 13, 2026. http://jrnl.kai.edu.ua/index.php/VisnikPP/article/view/2117.