Chromińska, Maria. “The Effect of Income of Fertility Rates in the Wielkopolska Region by Country During the Years 1999-2010”. Studia Oeconomica Posnaniensia 1, no. 5 (May 31, 2013): s. 5–25. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3209.