APA (7th ed.) Citation

United States. Bureau of Mines. (1937). Analyses of Colorado coals. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Analyses of Colorado Coals. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. Bureau of Mines. Analyses of Colorado Coals. [s.n.], 1937.

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