APA (7th ed.) Citation

(1932). Army extension courses: Extension course of Air Corps schools, subcourse 20-11, theory of bombing, 1932-33. GPO.

Chicago Style (17th ed.) Citation

Army Extension Courses: Extension Course of Air Corps Schools, Subcourse 20-11, Theory of Bombing, 1932-33. [Washington]: GPO, 1932.

MLA (9th ed.) Citation

Army Extension Courses: Extension Course of Air Corps Schools, Subcourse 20-11, Theory of Bombing, 1932-33. GPO, 1932.