Kiersnowska, Iwona, Dorota Sys, Barbara Baranowska, Grażyna Bączek, and Piotr Węgrzyn. “Pregnancy, Childbirth and Puerperium Health Problems in Women Over 35 Years of Age ”. Quarterly Journal Fides et Ratio 47, no. 3 (September 30, 2021): 72–83. Accessed August 7, 2025. https://fidesetratio.com.pl/ojs/index.php/FetR/article/view/878.