APA (7th ed.) Citation

Keyes, H. E. (1930). Innovations in copper leaching employing ferric sulphate-sulphuric acid. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Keyes, Harmon Edward. Innovations in Copper Leaching Employing Ferric Sulphate-sulphuric Acid. [Washington?]: U.S. Government Printing Office, 1930.

MLA (9th ed.) Citation

Keyes, Harmon Edward. Innovations in Copper Leaching Employing Ferric Sulphate-sulphuric Acid. U.S. Government Printing Office, 1930.