APA (7th ed.) Citation

Keyes, H. E. (1929). Development of a copper extraction process. Engineering & Mining Journal (00958948), 128, 545.

Chicago Style (17th ed.) Citation

Keyes, H. E. "Development of a Copper Extraction Process." Engineering & Mining Journal (00958948) 128 (1929): 545.

MLA (9th ed.) Citation

Keyes, H. E. "Development of a Copper Extraction Process." Engineering & Mining Journal (00958948), vol. 128, 1929, p. 545.

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