Vought-Sikorsky VS-300 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Vought-Sikorsky VS-300" in English language version.

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asme.org

"A National Historic Engineering Landmark: VS-300 Helicopter (1939)" Archived 2011-09-29 at the Wayback Machine. Crystal City, Virginia: The American Society of Mechanical Engineers, American Helicopter Society, 17 May 1984.

Savine, Alexandre. "TsAGI 1-EA" Archived 2009-01-26 at the Wayback Machine. ctrl-c.liu.se, 24 March 1997. Retrieved 12 December 2010.

"Timeline" Archived 2009-11-03 at the Wayback Machine. Sikorsky.com. Retrieved: 22 September 2009.

Savine, Alexandre. "TsAGI 1-EA" Archived 2009-01-26 at the Wayback Machine. ctrl-c.liu.se, 24 March 1997. Retrieved 12 December 2010.
"A National Historic Engineering Landmark: VS-300 Helicopter (1939)" Archived 2011-09-29 at the Wayback Machine. Crystal City, Virginia: The American Society of Mechanical Engineers, American Helicopter Society, 17 May 1984.
"Timeline" Archived 2009-11-03 at the Wayback Machine. Sikorsky.com. Retrieved: 22 September 2009.