APA (7th ed.) Citation

United States. War Department. (1918). Retention by officers and enlisted men of gas masks and helmets. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Retention by Officers and Enlisted Men of Gas Masks and Helmets. Washington: U.S. GPO, 1918.

MLA (9th ed.) Citation

United States. War Department. Retention by Officers and Enlisted Men of Gas Masks and Helmets. U.S. GPO, 1918.

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