APA (7th ed.) Citation

United States. War Department & United States. War Office. (1947). 20-MM automatic gun M3. War Dept..

Chicago Style (17th ed.) Citation

United States. War Department and United States. War Office. 20-MM Automatic Gun M3. Washington, D.C.: War Dept., 1947.

MLA (9th ed.) Citation

United States. War Department and United States. War Office. 20-MM Automatic Gun M3. War Dept., 1947.

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