Kuszniar, K., E. Firlej, M. Janiszewska, J. Konarska, P. Kustra, and A. Barańska. “Needs and Ways to Meet Them by Adolescents During Adolescence”. Journal of Education, Health and Sport, vol. 7, no. 8, Aug. 2017, pp. 894-06, https://apcz.umk.pl/JEHS/article/view/4861.