Czarnota, J., T. Skubel, M. Dobrzyński, D. Sokół, A. Standyło, and H. Piecewicz-Szczęsna. “The Correllation Between Incidence Rate of Pertussis and Vaccination Rate of Children from 1998 to 2016 in Poland”. Journal of Education, Health and Sport, vol. 9, no. 6, June 2019, pp. 491-5, https://apcz.umk.pl/JEHS/article/view/7069.