↑ A History of Western Civilization: Then came the acquisition of Prussia (separated from Brandenburg by the "Polish corridor") page 382, author Roland N. Stromberg Dorsey Press 1969.
↑ The Scandinavians in History. "Brandenburg, by the acquisition of Eastern Pomerania besides other territories within the empire was firmly established on the Baltic, though a Polish corridor running between Eastern Pomerania and East Prussia to Danzig denied her all she desired", page 174, author Stanley Mease Toyne. Ayer Publishing 1970
