APA (7th ed.) Citation

United States. Bureau of Mines. (1937). Report of investigations: Progress reports, Metallurgical Division: 21, Studies in nonferrous metallurgy. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Report of Investigations: Progress Reports, Metallurgical Division: 21, Studies in Nonferrous Metallurgy. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. Bureau of Mines. Report of Investigations: Progress Reports, Metallurgical Division: 21, Studies in Nonferrous Metallurgy. [s.n.], 1937.