APA (7th ed.) Citation

United States. War Department. (1940). Army Regulations, No. 350-400, Change 1: Military Education, Cavalry School. [s.n.].

Chicago Style (17th ed.) Citation

United States. War Department. Army Regulations, No. 350-400, Change 1: Military Education, Cavalry School. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. War Department. Army Regulations, No. 350-400, Change 1: Military Education, Cavalry School. [s.n.], 1940.