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References
- 1 2 3 "American airplanes: Da - Dy". www.aerofiles.com. 11 March 2009. Retrieved 19 November 2011.
- ↑ The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing. p. 1455.
- ↑ R.Simpson "Airlife's Helicopter and Rotorcraft", 1998
- ↑ "Vertipedia - Doman LZ-4 (CW-40)". vertipedia.vtol.org. Retrieved 28 January 2019.