Gromysz-Kałkowska, Kazimiera, Aneta Unkiewicz-Winiarczyk, and Ewa Szubartowska. 2011. “The Problem of Tobacco Smoking Among High School Students under the Survey Research”. Polish Journal of Public Health 121 (4): 332-37. https://czasopisma.umlub.pl/pjph/article/view/1931.