Coba jelasin Kutipan dari Sikorsky H-5 dong

Polmar, Norman and Floyd D. Kennedy, Jr. Military Helicopters of the World: Military Rotary-wing Aircraft Since 1917.. Annapolis, Maryland: Naval Institute Press, 1981. ISBN 0-87021-383-0.

Rawlins, Eugene W., Lt. Col. Marines and Helicopters 1946–1962. Washington, D.C.: History and Museums Division, U.S. Marine Corps, 1976.

Swanborough, F.G. and Peter M. Bowers. United States Military Aircraft since 1909. London: Putnam, 1963.

United States Air Force Museum Guidebook. Wright-Patterson AFB, Ohio: Air Force Museum Foundation, 1975.