Bojarczuk, K., M. Lewicki, K. Morshed, M. Michalczak, and A. Smoleń. “Comparison of Differences in Knowledge about Skin Care Bettwen Young Women and Man”. Journal of Education, Health and Sport, vol. 7, no. 8, Aug. 2017, pp. 1026-39, https://apcz.umk.pl/JEHS/article/view/4915.