APA (7th ed.) Citation

United States. Army. American Expeditionary Forces. (1919). Defense against gas. General Headquarters, American Expeditionary Forces, France.

Chicago Style (17th ed.) Citation

United States. Army. American Expeditionary Forces. Defense Against Gas. [Washington]: General Headquarters, American Expeditionary Forces, France, 1919.

MLA (9th ed.) Citation

United States. Army. American Expeditionary Forces. Defense Against Gas. General Headquarters, American Expeditionary Forces, France, 1919.

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