“KEY SUBJECTS OF THE SOCIO-PEDAGOGICAL ACTIVITY ORGANIZATION IN UKRAINE IN THE TWENTIETH – THE FIRST HALF OF THE THIRTIETH OF THE XXTH CENTURY”. Bulletin of Taras Shevchenko National University of Kyiv. Social Work, vol. 1, no. 1, Apr. 2020, pp. 34-38, https://socialwork.bulletin.knu.ua/article/view/8891.