APA (7th ed.) Citation

United States. Army. Air Corps. (1920). Technical Orders No. 19. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Technical Orders No. 19. McCook Field, Ohio: [publisher not identified], 1920.

MLA (9th ed.) Citation

United States. Army. Air Corps. Technical Orders No. 19. [publisher not identified], 1920.

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