Saraeva, Olena. “The Pedagogical Press of the 20-30-Ies of the XX Century As a Source of the Study of the History of Childrenʼs Collective”. Pedagogical Discourse0, no. 15 (October 10, 2013): 622-626. Accessed July 19, 2024. http://ojs.kgpa.km.ua/index.php/peddiscourse/article/view/916.