Sagan, G. “Theoretical Frames of Childhood Studying: Classification and Heuristic Possibilities”. Visnyk of V. N. Karazin Kharkiv National University. Series "Sociological Studies of Contemporary Society: Methodology, Theory, methods", no. 1101, Aug. 2019, pp. 81-89, https://periodicals.karazin.ua/ssms/article/view/13572.