SZYMAŃSKA, Daniela, ŚRODA-MURAWSKA, Stefania, ŚWIDERSKA, Karolina and ADAMIAK, Czesław. Internal Migration in Germany in 1990 And 2005. Bulletin of Geography. Socio-economic Series. Online. 1 December 2009. No. 12, p. 109–120. [Accessed 18 July 2024]. DOI 10.1515/v10089-009-0007-0.