APA (7th ed.) Citation

United States. Army. Signal Corps. (1931). Class D and obsolete equipment. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Signal Corps. Class D and Obsolete Equipment. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Army. Signal Corps. Class D and Obsolete Equipment. U.S. GPO, 1931.

Warning: These citations may not always be 100% accurate.