APA (7th ed.) Citation

Hotchkiss, W. E. (1940). Mechanization, employment, and output per man in bituminous-coal mining. Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines.

Chicago Style (17th ed.) Citation

Hotchkiss, Willard E. Mechanization, Employment, and Output Per Man in Bituminous-coal Mining. Philadelphia, Pennsylvania: Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines, 1940.

MLA (9th ed.) Citation

Hotchkiss, Willard E. Mechanization, Employment, and Output Per Man in Bituminous-coal Mining. Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines, 1940.