APA (7th ed.) Citation

United States. War Department. (1931). Army extension courses: Extension course of Signal School, subcourse 30-6, signal supply, 1931-32. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Army Extension Courses: Extension Course of Signal School, Subcourse 30-6, Signal Supply, 1931-32. [Washington]: GPO, 1931.

MLA (9th ed.) Citation

United States. War Department. Army Extension Courses: Extension Course of Signal School, Subcourse 30-6, Signal Supply, 1931-32. GPO, 1931.