APA (7th ed.) Citation

United States. War Department. General Staff. (1918). Conventional signs, U.S. Army maps. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. General Staff. Conventional Signs, U.S. Army Maps. Washington: U.S. GPO, 1918.

MLA (9th ed.) Citation

United States. War Department. General Staff. Conventional Signs, U.S. Army Maps. U.S. GPO, 1918.

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