Não informado. (1945). American helicopter. American Helicopter Magazine.
Chicago (17e ed.) BronvermeldingNão informado. American Helicopter. New York: American Helicopter Magazine, 1945.
MLA (8e ed.) BronvermeldingNão informado. American Helicopter. American Helicopter Magazine, 1945.
Let op: Deze citaties zijn niet altijd 100% accuraat.