^Memo, Adjutant General to Chief of the Air Corps, Jan. 11, 1938, Development Program Approved. Telegram, Chief of Air Corps to Wright Field, Revised Aircraft Specifications Approved Apr. 26, 1938, and Wright Field Contracting Officer, Circular Proposal 39-2 Released, August 23, 1938. All in NARA Wright Field Development Program Files, ARC-6545367.
Adcock, Al. US Liaison Aircraft in action (Aircraft in Action: No. 195). Carrollton, Texas: Squadron/Signal Publications, 2005. ISBN978-0897474870.
Donald, David (ed.). American Warplanes of World War II. London: Aerospace Publishing, 1995. ISBN1-874023-72-7.
Eden, Paul and Soph Moeng (eds.). The Complete Encyclopedia of World Aircraft. London: Amber Books Ltd., 2002. ISBN0-7607-3432-1
Gray, James H. L-5 History Blog #17 (2021), and notes from the Wright Field Liaison Program papers at the National Archives. www.sentinelclub.org.Template:Nonspecific
Merriam, Ray (ed.). World War II Journal #15: U.S. Military Aircraft of World War II. Bennington, Vermont, USA: Merriam Press, 2002. ISBN1-57638-167-6.
Ogden, Bob. Aviation Museums and Collections of North America. Tonbridge, Kent, UK: Air-Britain (Historians ) Ltd, 2007. ISBN0-85130-385-4.
The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). London: Orbis Publishing, 1985.