APA (7th ed.) Citation

United States. Army. Air Corps. (1918). German airplanes in service or on trial. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. German Airplanes in Service or on Trial. [Place of publication not identified]: [publisher not identified], 1918.

MLA (9th ed.) Citation

United States. Army. Air Corps. German Airplanes in Service or on Trial. [publisher not identified], 1918.