Ruszel, K., P. Pokorski, and H. P. Szczęsna. “Gonorrhoea – Current Threat? Epidemiological Analysis of Gonococcal Infections”. Journal of Education, Health and Sport, vol. 9, no. 9, Sept. 2019, pp. 406-14, https://apcz.umk.pl/JEHS/article/view/7423.