APA (7th ed.) Citation

United States. Federal Board for Vocational Education. (1931). Coal-mine gases: Technical information for use in vocational training classes. GPO.

Chicago Style (17th ed.) Citation

United States. Federal Board for Vocational Education. Coal-mine Gases: Technical Information for Use in Vocational Training Classes. [Washington]: GPO, 1931.

MLA (9th ed.) Citation

United States. Federal Board for Vocational Education. Coal-mine Gases: Technical Information for Use in Vocational Training Classes. GPO, 1931.