APA (7th ed.) Citation

Allen. (1996). The helicopter: An illustrated history of rotary-winged aircraft. Airlife.

Chicago Style (17th ed.) Citation

Allen. The Helicopter: An Illustrated History of Rotary-winged Aircraft. Shrewsbury,England: Airlife, 1996.

MLA (9th ed.) Citation

Allen. The Helicopter: An Illustrated History of Rotary-winged Aircraft. Airlife, 1996.

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