APA (7th ed.) Citation

Carnahan, J., Petersen, S., & Sullivan, J. (1982). Shadows of Yog-Sothoth: A global campaign to save mankind. Chaosium Inc..

Chicago Style (17th ed.) Citation

Carnahan, John, Sandy Petersen, and John Sullivan. Shadows of Yog-Sothoth: A Global Campaign to Save Mankind. Albany, CA: Chaosium Inc., 1982.

MLA (9th ed.) Citation

Carnahan, John, et al. Shadows of Yog-Sothoth: A Global Campaign to Save Mankind. Chaosium Inc., 1982.