Łosień, Tomasz, Anna Mędrak, Paweł Plaskacz, Izabela Bajerska, Magdalena Reut, Emilia Dragon, Martyna Polko, and Aleksandra Cebula. 2017. “Physical Activity of Pregnant and Postpartum Women”. Journal of Education, Health and Sport 7 (5):1011-19. https://apcz.umk.pl/JEHS/article/view/5542.