APA (7th ed.) Citation

United States. War Department. (1931). Infantry and aircraft armament: Browning aircraft machine gun, caliber .50, M1921. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Infantry and Aircraft Armament: Browning Aircraft Machine Gun, Caliber .50, M1921. [Washington]: GPO, 1931.

MLA (9th ed.) Citation

United States. War Department. Infantry and Aircraft Armament: Browning Aircraft Machine Gun, Caliber .50, M1921. GPO, 1931.

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