APA (7th ed.) Citation

United States. Army. Air Corps. (1920). Handbook on airplane machine gun sights. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Handbook on Airplane Machine Gun Sights. McCook Field, Ohio: [publisher not identified], 1920.

MLA (9th ed.) Citation

United States. Army. Air Corps. Handbook on Airplane Machine Gun Sights. [publisher not identified], 1920.

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