APA (7th ed.) Citation

United States. National Bituminous Coal Commission. Office of the Consumer's Counsel. (1938). Know your coal [classification of coal for consumers]. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Bituminous Coal Commission. Office of the Consumer's Counsel. Know Your Coal [classification of Coal for Consumers]. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. National Bituminous Coal Commission. Office of the Consumer's Counsel. Know Your Coal [classification of Coal for Consumers]. [s.n.], 1938.