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References

1. Emmanuel Gustin; Anthony G. Williams (2003). Flying Guns: The Development of Aircraft Guns, Ammunition and Installations, 1933-45. Airlife. p. 153. ISBN 978-1-84037-227-4. 
2. Ian V. Hogg (2001). The American Arsenal: The World War II Official Standard Ordnance Catalog of Small Arms, Tanks, Armored Cars, Artillery, Antiaircraft Guns, Ammunition, Grenades, Mines, Etc. Greenhill Books. p. 217. ISBN 978-1-85367-470-9. 
3. Gordon Rottman (2011). US Patrol Torpedo Boats: World War II. Osprey Publishing. p. 22. ISBN 978-1-78096-208-5. 
4. Loza, Dmitriĭ Fedorovich (2002). Attack of the Airacobras: Soviet aces, American P-39's and the air war against Germany. University Press of Kansas. p. 359. ISBN 0-7006-1140-1. 
5. Drabkin, Artem. The Red Air Force at War: Barbarossa and the Retreat to Moscow – Recollections of Fighter Pilots on the Eastern Front. Barnsley, South Yorkshire, UK: Pen & Sword Military, 2007, p. 133. ISBN:1-84415-563-3.
6. George Chinn 1951, The Machine Gun: Development During World War II and Korean Conflict by the United States and their Allies of Full Automatic Machine Gun Systems and High Rate of Fire Power Driven Cannon, Volume III, Parts VIII and IX., p. 352
7. Anthony G. Williams (2002). Rapid Fire: The Development of Automatic Cannon, Heavy Machine-Guns and Their Ammunition for Armies, Navies and Air Forces. Airlife. pp. 155–156. ISBN 978-1-84037-435-3.