Romanovsky, A., and V. Mikhailichenko. “The Role of Self-Improvement in a person’s Spiritual Development and Its Mechanisms”. Problems of Engineer-Pedagogical Education, no. 52-53 (April 23, 2018): 387–403. Accessed April 19, 2025. https://jped.uipa.edu.ua/index.php/JPED/article/view/142.