APA (7th ed.) Citation

United States. War Department. (1942). The horse gas masks, M4 and M5. [U.S. Govt. Print. Off].

Chicago Style (17th ed.) Citation

United States. War Department. The Horse Gas Masks, M4 and M5. [Washington]: [U.S. Govt. Print. Off], 1942.

MLA (9th ed.) Citation

United States. War Department. The Horse Gas Masks, M4 and M5. [U.S. Govt. Print. Off], 1942.