APA (7th ed.) Citation

United States. Bureau of Mines. (1937). Ball-­mill grinding. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Ball-­mill Grinding. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. Bureau of Mines. Ball-­mill Grinding. [s.n.], 1937.

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