APA (7th ed.) Citation

Kurth, H. (1975). Helicopters. World's Work.

Chicago Style (17th ed.) Citation

Kurth, Heinz. Helicopters. Kingswood, Tadworth, Surrey: World's Work, 1975.

MLA (9th ed.) Citation

Kurth, Heinz. Helicopters. World's Work, 1975.

Warning: These citations may not always be 100% accurate.