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Gunston, Bill. The Illustrated Encyclopedia of Aircraft Armament. New York, NY: Orion Books, 1988. ISBN 0-517-56607-9.
Jane's Weapon Systems, 1986-1987. Ronald T Pretty, Ed. London, UK: Jane's Publishing Company, Ltd, 1986. ISBN 0-7106-0832-2
Small arms of the world - The Telegraph Press, Harriburg, Pa. USA 1969.
Gervasi, Tom. Arsenal of Democracy III: America's War Machine, the Pursuit of Global Dominance. New York, NY: Grove Press, Inc, 1984. ISBN 0-394-54102-2.
Julia Keller. 2008. Mr Gatling's Terrible Marvel: The Gun That Changed Everything and the Misunderstood Genius Who Invented It. Viking. ISBN 978-0670018949
Gervasi, Tom. Arsenal of Democracy III: America's War Machine, the Pursuit of Global Dominance. New York, NY: Grove Press, Inc, 1984. ISBN 0-394-54102-2.
Julia Keller. 2008. Mr Gatling's Terrible Marvel: The Gun That Changed Everything and the Misunderstood Genius Who Invented It. Viking. ISBN 978-0670018949, ISBN 978-670018949.
Davis, Larry. Gunships: A Pictorial History of Spooky. TX: Squadron/Signal Publications, Inc, 1982. ISBN 0-89747-123-7
United States. Headquarters, Department of the Army. FM 1-40 Attack Helicopter Gunnery. Washington, DC: Headquarters, Department of the Army, 1969.
