Niedorys, Barbara, Katarzyna Kocka, Barbara Ślusarska, and Agnieszka Chrzan-Rodak. 2018. “The Degree of the Internet Addiction and the Psycho-Social Functioning of Young People”. Journal of Education, Health and Sport 8 (12):275-84. https://apcz.umk.pl/JEHS/article/view/6370.