United States. Department of Commerce. (1920). Efficiency of mine labor with special consideration of industrial medicine and health conservation. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Department of Commerce. Efficiency of Mine Labor with Special Consideration of Industrial Medicine and Health Conservation. [Washington]: [publisher not identified], 1920.
MLA (9th ed.) CitationUnited States. Department of Commerce. Efficiency of Mine Labor with Special Consideration of Industrial Medicine and Health Conservation. [publisher not identified], 1920.
Warning: These citations may not always be 100% accurate.