Cita APA

Lewis, R. S. (1939). Mining, the priceless heritage. Extension Division, University of Utah.

Citación estilo Chicago

Lewis, Robert S. Mining, the Priceless Heritage. Salt Lake City: Extension Division, University of Utah, 1939.

Cita MLA

Lewis, Robert S. Mining, the Priceless Heritage. Extension Division, University of Utah, 1939.

Warning: These citations may not always be 100% accurate.