Siedlecka, Dagna, Paulina Wróbel-Knybel, Ewa Krzewicka-Romaniuk, Wojciech Micał, and Marcin Skoczyński. 2019. “Postpartum Depression – a Mood Disorder After Delivery”. Journal of Education, Health and Sport 9 (9):1124-30. https://apcz.umk.pl/JEHS/article/view/7553.