S. Nevskaja, S., and E. Mettini. “Perspective Lines System in A.S. Makarenko’s Pedagogical Experience”. International Journal of Engineering & Technology 7, no. 4.38 (December 3, 2018): 1200–1204. Accessed November 24, 2024. https://sciencepubco.com/index.php/ijet/article/view/27762.