Lockheed XH-51 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Lockheed XH-51" in English language version.

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Lentine, F. P.; Groth, W. P.; Oglesby, T. H. (June 1968). "Research in Maneuverability of the XH-51A Compound Helicopter". Lockheed. Archived from the original on 2014-09-03. Retrieved 27 August 2014.

Robb, Raymond L. (Summer 2006). "Hybrid helicopters: Compounding the quest for speed" (PDF). Vertiflite. Vol. 52, no. 2. American Helicopter Society. pp. 30–54. Archived from the original (PDF) on 2006-09-27. Retrieved 8 November 2008.
Hirschberg, Michael J.; Daley, David K. "US and Russian Helicopter Development In the 20th Century". American Helicopter Society, International. Archived from the original on 2001-06-05. Retrieved 16 November 2007.

Connor, R. Lockheed CL-475. Smithsonian National Air & Space Museum. Revised on 15 August 2002. Accessed on 3 September 2007.
Robb, Raymond L. (Summer 2006). "Hybrid helicopters: Compounding the quest for speed" (PDF). Vertiflite. Vol. 52, no. 2. American Helicopter Society. pp. 30–54. Archived from the original (PDF) on 2006-09-27. Retrieved 8 November 2008.
Hirschberg, Michael J.; Daley, David K. "US and Russian Helicopter Development In the 20th Century". American Helicopter Society, International. Archived from the original on 2001-06-05. Retrieved 16 November 2007.
Lentine, F. P.; Groth, W. P.; Oglesby, T. H. (June 1968). "Research in Maneuverability of the XH-51A Compound Helicopter". Lockheed. Archived from the original on 2014-09-03. Retrieved 27 August 2014.
"Rotary Wing Collection". United States Army Aviation Museum. Archived from the original on July 13, 2012.{{cite web}}: CS1 maint: unfit URL (link)