Jankowska, P., K. Jankowski, A. Tarkowska, J. Haracz, and M. Tadla. “Attitudes towards Breastfeeding Among Mothers of Children Treated at the University Children’s Hospital in Lublin”. Journal of Education, Health and Sport, vol. 9, no. 9, Sept. 2019, pp. 670-8, https://apcz.umk.pl/JEHS/article/view/7482.