APA (7th ed.) Citation

Chinn, G. M. (1951). The machine gun. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Chinn, George M. The Machine Gun. Washington: U.S. G.P.O., 1951.

MLA (9th ed.) Citation

Chinn, George M. The Machine Gun. U.S. G.P.O., 1951.