APA (7th ed.) Citation

United States. War Plans Division. (1918). Aerial observation for artillery. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. War Plans Division. Aerial Observation for Artillery. Washington: [publisher not identified], 1918.

MLA (9th ed.) Citation

United States. War Plans Division. Aerial Observation for Artillery. [publisher not identified], 1918.

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