Nota

Sumber

• Ballard, Jack S. (1982). "Development and Employment of Fixed-Wing Gunships, 1962–1972" (PDF). Air Force Historical Studies Office. m/s. 9. Dicapai 7 February 2011. 
• Bishop, Chris (2006). HueyCobra Gunships. m/s. 3–5. ISBN 9781841769844. 
• Dorr, Robert F. (July 2, 2011). "Brilliant Mistakes: The YB-40". defensemedianetwork.com. Dicapai April 23, 2012. 
• Dunstan, Simon (2003-08-20). Vietnam Choppers (Revised Edition): Helicopters in Battle 1950–1975. m/s. 25–27. ISBN 9781841767963. 
• Hamlin, Ross E. (1970). "Side-Firing Weapon Systems: A New Application of an Old Concept" (PDF). Air University Review. Dicapai 16 December 2016. 
• Merriam, Ray (2000). U. S. Warplanes of World War II. ISBN 9781576381670. 
• "NORTH AMERICAN B-25B MITCHELL factsheet". National Museum of the United States Air Force. 
• Skaarup, Harold (2012). California Warplanes. m/s. 265. ISBN 978-1-4759-0144-3. 
• Stringer, Kevin D. (2006). Military Organizations for Homeland Defense and Smaller-Scale Contingencies. Praeger Publishers. m/s. 124. ISBN 0-275-99308-6.