Não informado. (1956). Journal of the American Helicopter Society. American Helicopter Society.
Chicago-referens (17:e uppl.)Não informado. Journal of the American Helicopter Society. Washington: American Helicopter Society, 1956.
MLA-referens (8:e uppl.)Não informado. Journal of the American Helicopter Society. American Helicopter Society, 1956.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.