Lockheed AH-56 Cheyenne (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Lockheed AH-56 Cheyenne" in English language version.

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army.mil

Center of Military History. "Chapter III: Force Development" Archived 24 October 2008 at the Wayback Machine. Department of Army Historical Summary. Washington D.C.: Department of the Army, 1969. p. 29. Accessed 29 September 2008.
Center of Military History. "Chapter V: Force Development" Archived 1 January 2017 at the Wayback Machine. Dept. of the Army Historical Summary, 1972. Washington, D.C.: Headquarters, Department of the Army, 1972. Accessed 31 October 2008.

Horwood, Ian (2006). Interservice Rivalry and Air Power in the Vietnam War (PDF). Combat Studies Institute Press. pp. 131–134. Archived from the original (PDF) on 13 August 2011.

Gershon, Eric (18 August 2010). "Sikorsky Breaks Speed Record With X2 Helicopter – Again – But Is It Really a Helicopter?". Hartford Courant. Hartford, Connecticut. Retrieved 31 December 2011. Section 9 of the [Fédération Aéronautique Internationale's] Sporting Code for rotorcraft...says a helicopter is a "rotorcraft which, in flight, derives substantially the whole of its lift from a power-driven rotor system whose axis (axes) is (are) fixed and substantially perpendicular to the longitudinal axis of the rotorcraft."

Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

Marker, Doug. "The Cheyenne rotor system" Internet Age, 12 February 2000. Accessed: 30 August 2014.

Horwood, Ian (2006). Interservice Rivalry and Air Power in the Vietnam War (PDF). Combat Studies Institute Press. pp. 131–134. Archived from the original (PDF) on 13 August 2011.
Center of Military History. "Chapter III: Force Development" Archived 24 October 2008 at the Wayback Machine. Department of Army Historical Summary. Washington D.C.: Department of the Army, 1969. p. 29. Accessed 29 September 2008.
Center of Military History. "Chapter V: Force Development" Archived 1 January 2017 at the Wayback Machine. Dept. of the Army Historical Summary, 1972. Washington, D.C.: Headquarters, Department of the Army, 1972. Accessed 31 October 2008.