APA (7th ed.) Citation

Gardner, E. D., & Parker, D. J. (1929). Safety organizations in Arizona copper mines. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Gardner, E. D., and Dorsey J. Parker. Safety Organizations in Arizona Copper Mines. Washington: U.S. Govt. Print. Off, 1929.

MLA (8th ed.) Citation

Gardner, E. D., and Dorsey J. Parker. Safety Organizations in Arizona Copper Mines. U.S. Govt. Print. Off, 1929.