Leziak, Milena, Sylwiusz Niedobylski, Klaudia Żak, Katarzyna Skórzyńska-Dziduszko, and Danuta Krasowska. 2019. “Prolactin – Friendly Lactation Hormone or Hostile Cancerogenic Factor?”. Journal of Education, Health and Sport 9 (9):247-52. https://apcz.umk.pl/JEHS/article/view/7390.