MLA

Greif, Martin. The Gay Book of Days : an Evocatively Illustrated Who's Who of Who Is, Was, May Have Been, Probably Was, and Almost Certainly Seems to Have Been Gay During the Past 5000 Years. 7th ed. New York: Carol Publishing Group, 1989.

APA

Greif, M. (1989). The gay book of days : an evocatively illustrated who's who of who is, was, may have been, probably was, and almost certainly seems to have been gay during the past 5000 years. 7th ed. New York: Carol Publishing Group.

Chicago

Greif, Martin The Gay Book of Days: An Evocatively Illustrated Who's Who of Who Is, Was, May Have Been, Probably Was, and Almost Certainly Seems to Have Been Gay During the Past 5000 Years. 7th ed. New York: Carol Publishing Group, 1989.