APA (7th ed.) Citation

Engels Copper Mining Co & Nelson, W. I. (1932). Milling methods and costs at Superior concentrator of Engels Copper Mining Company, Plumas County, Calif. [publisher not identified].

Chicago Style (17th ed.) Citation

Engels Copper Mining Co and W. I. Nelson. Milling Methods and Costs at Superior Concentrator of Engels Copper Mining Company, Plumas County, Calif. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Engels Copper Mining Co and W. I. Nelson. Milling Methods and Costs at Superior Concentrator of Engels Copper Mining Company, Plumas County, Calif. [publisher not identified], 1932.