Spychalska, Julita. “The Influence of Physical Activity, Specialized Exercises and Diet on Pregnancy and Delivery According to Pregnant Women Attending a Childbirth School”. Journal of Education, Health and Sport 11, no. 12 (December 11, 2021): 89–138. Accessed April 23, 2024. https://apcz.umk.pl/JEHS/article/view/36479.