APA (7th ed.) Citation

Hodder, M. H., Ballard, D. A., & Gammack, G. (1992). Controlling drilling fluid enzyme activity. Petroleum Engineer International, 64, 31.

Chicago Style (17th ed.) Citation

Hodder, M. H., D. A. Ballard, and G. Gammack. "Controlling Drilling Fluid Enzyme Activity." Petroleum Engineer International 64 (1992): 31.

MLA (9th ed.) Citation

Hodder, M. H., et al. "Controlling Drilling Fluid Enzyme Activity." Petroleum Engineer International, vol. 64, 1992, p. 31.