Szewczak, A., J. Bąk, P. Węgorowski, and D. Zarzycka. “The Knowledge of Mothers on Prevention of Diarrhea in Infancy”. Journal of Education, Health and Sport, vol. 8, no. 11, Nov. 2018, pp. 156-64, https://apcz.umk.pl/JEHS/article/view/6241.