APA (7th ed.) Citation

Root, D. H., & Drew, L. J. (1979). Pattern of petroleum discovery rates. American Scientist, 67, 648.

Chicago Style (17th ed.) Citation

Root, D. H., and L. J. Drew. "Pattern of Petroleum Discovery Rates." American Scientist 67 (1979): 648.

MLA (9th ed.) Citation

Root, D. H., and L. J. Drew. "Pattern of Petroleum Discovery Rates." American Scientist, vol. 67, 1979, p. 648.