Рєпкін, В. В., and Н. В. Рєпкіна. “TO A QUESTION ОF DEVELOPING EDUCATION THEORY (PART 1)”. The Journal of V. N. Karazin Kharkiv National University. A Series of «Psychology», no. 64, Sept. 2018, pp. 75-79, https://periodicals.karazin.ua/psychology/article/view/11262.