APA (7th ed.) Citation

United States. Army. (1920). Artillery notes for observers. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Artillery Notes for Observers. Washington: U.S. GPO, 1920.

MLA (9th ed.) Citation

United States. Army. Artillery Notes for Observers. U.S. GPO, 1920.

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