APA (7th ed.) Citation

United States. Adjutant General's Department. (1940). Army Directory, Oct. 1940. [s.n.].

Chicago Style (17th ed.) Citation

United States. Adjutant General's Department. Army Directory, Oct. 1940. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. Adjutant General's Department. Army Directory, Oct. 1940. [s.n.], 1940.