Mazur, Karol, Dominik Machaj, and Dominika Mazur. “Physical Activity During Pregnancy - Literature Review”. Journal of Education, Health and Sport 10, no. 1 (January 13, 2020): 11–15. Accessed February 1, 2023. https://apcz.umk.pl/JEHS/article/view/JEHS.2020.10.01.001.