APA (7th ed.) Citation

Clark, M., & DeBruin, R. H. (1981). Helium, a vital natural resource. Geological Survey of Wyoming.

Chicago Style (17th ed.) Citation

Clark, Michael, and Rodney H. DeBruin. Helium, a Vital Natural Resource. Laramie, Wyo. (P.O. Box 3008, University Station, Laramie 82071): Geological Survey of Wyoming, 1981.

MLA (9th ed.) Citation

Clark, Michael, and Rodney H. DeBruin. Helium, a Vital Natural Resource. Geological Survey of Wyoming, 1981.