APA (7th ed.) Citation

United States. War Department. (1921). Signal Corps: Photography, photographs. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Signal Corps: Photography, Photographs. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

United States. War Department. Signal Corps: Photography, Photographs. GPO, 1921.

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