Zając, A., K. Dobko, G. Frącz, A. Glac, K. Kuliga, K. Musz, N. Sejnowska, A. Socha, A. Surowiec, and K. Śnieżek. “Causes of Depressive Disorders and Their Degree and Severity Among High School Students”. Journal of Education, Health and Sport, vol. 18, no. 1, July 2023, pp. 123-46, doi:10.12775/JEHS.2023.18.01.012.