Lewis, R. S. (1939). Mining, the priceless heritage. Extension Division, University of Utah.
Chicago Style (17th ed.) CitationLewis, Robert S. Mining, the Priceless Heritage. Salt Lake City: Extension Division, University of Utah, 1939.
Cita MLALewis, Robert S. Mining, the Priceless Heritage. Extension Division, University of Utah, 1939.
Atenció: Aquestes cites poden no estar 100% correctes.