APA (7th ed.) Citation

McElroy, G. E. (1930). Ventilation of large copper mines of Arizona. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

McElroy, G. E. Ventilation of Large Copper Mines of Arizona. [Washington?]: U.S. Government Printing Office, 1930.

MLA (9th ed.) Citation

McElroy, G. E. Ventilation of Large Copper Mines of Arizona. U.S. Government Printing Office, 1930.