APA (7th ed.) Citation

United States. Army. Chemical Warfare Service. (1930). Chemical Warfare Service: Gas mask. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Chemical Warfare Service. Chemical Warfare Service: Gas Mask. Washington: U.S. GPO, 1930.

MLA (9th ed.) Citation

United States. Army. Chemical Warfare Service. Chemical Warfare Service: Gas Mask. U.S. GPO, 1930.

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