Feduniw, S., O. Płaza, D. Paździor, K. Kosińska-Kaczyńska, I. Szymusik, and M. Wielgoś. “Depressive symptoms during pregnancy and their risk factors – a cross-sectional study”. European Journal of Clinical and Experimental Medicine, vol. 18, no. 1, Mar. 2020, pp. 10–15, doi:10.15584/ejcem.2020.1.2.