The Heinkel He 49 was a German single-bay, single-seat biplane of mixed construction armed with two machine guns. Four variants were made, the He 49a, He 49b, He 49c and He 49d.[1]
↑Green, William; Swanborough, Gordon (1994). The Complete Book of Fighters. London: Salamander. ISBN1-85833-777-1.
↑Nowarra, Heinz J. (1993). Die Deutsche Luftrüstung 1933–1945 Vol.2 – Flugzeugtypen Erla-Heinkel (in German). Koblenz: Bernard & Graefe Verlag. pp.164, 268–269. ISBN3-7637-5464-4.