APA (7th ed.) Citation

(1931). Battery, 155-mm. howitzer, tractor-drawn; effective July 1, 1931. GPO.

Chicago Style (17th ed.) Citation

Battery, 155-mm. Howitzer, Tractor-drawn; Effective July 1, 1931. [Washington]: GPO, 1931.

MLA (9th ed.) Citation

Battery, 155-mm. Howitzer, Tractor-drawn; Effective July 1, 1931. GPO, 1931.

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