APA (7th ed.) Citation

United States. Army Materiel Command & Knovel (Firm). (1976). Helicopter engineering. The Command.

Chicago Style (17th ed.) Citation

United States. Army Materiel Command and Knovel (Firm). Helicopter Engineering. Alexandria, Va.: The Command, 1976.

MLA (9th ed.) Citation

United States. Army Materiel Command and Knovel (Firm). Helicopter Engineering. The Command, 1976.