APA (7th ed.) Citation

World Science Fiction Convention Denver, Colo, & Denvention. (1981). Denvention Two: The 39th World Science Fiction Convention, Denver, 1981. Denvention Two, Inc..

Chicago Style (17th ed.) Citation

World Science Fiction Convention Denver, Colo, and Denvention. Denvention Two: The 39th World Science Fiction Convention, Denver, 1981. [Denver, Colo.]: Denvention Two, Inc., 1981.

MLA (9th ed.) Citation

World Science Fiction Convention Denver, Colo, and Denvention. Denvention Two: The 39th World Science Fiction Convention, Denver, 1981. Denvention Two, Inc., 1981.