Found in articles
deportēti uz Vāciju. The Columbia Encyclopedia, Sixth Edition (2008), East Prussia (angliski) Ostpreußen: The Great Trek Encyclopedia Britannica: Old-Prussian-language;
Encyclopedia, Volume 1. ABC-CLIO. 2002. p. 304: "Friedland... A battle in East Prussia between French forces, ultimately numbering 80,000, commanded by Napoleon
Lietuvos Priesistorines Kulturos Apzvalga [A Survey of Prehistory of East Prussia and western Lithuania]. New York: Studia Lituaica I. — 1958. COWA Survey
Datums 1757. gada 30. augusts Vieta Gross-Jägersdorf, East Prussia ( Near present-day Mezhdurechye Kaliningrad Oblast) 54°37′N 21°29′E / 54.62°N 21.48°E