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References
- ↑ Stingray. "Comper-Cierva C.25 / G.31/1 - Stingray's List of Rotorcraft". sites.google.com. Retrieved 5 April 2020.
- ↑ Riding, Richard (June 1989). "Cierva C.25 - British pre-war lightplanes No 6". Aeroplane Monthly: 374–376.
- ↑ Young, Bill. "Cierva C.25 Blueprint". Blueprints.com. Retrieved 5 April 2020.