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References
- ↑ Lambermont, Paul Marcel; Pirie, Anthony (1970). Helicopters and autogyros of the world. Cassell. ISBN 978-0304933907.
- ↑ "unknown". Sport Aviation. April 1958.
{{cite journal}}: Cite uses generic title (help) - ↑ Green, William; Pollinger, Gerald John. The Aircraft of the World (new, revised and enlarged ed.). London: MacDonald. p. 196.
- ↑ "Goodyear GA-400R-3 Gizmo N69N 4". Rod's Aviation Photos: California Tour 2019: Classic Rotors Museum, Ramona Airport. Retrieved 19 June 2020.
- ↑ Bridgman, Leonard, ed. (1958). Jane's All the World's Aircraft 1958-59. London: Jane's All the World's Aircraft Publishing Co. Ltd. pp. 305–306.