APA (7th ed.) Citation

Gould, S. J. (1997). Questioning the millennium: A rationalist's guide to a precisely arbitrary countdown. Harmony Books.

Chicago Style (17th ed.) Citation

Gould, Stephen Jay. Questioning the Millennium: A Rationalist's Guide to a Precisely Arbitrary Countdown. New York: Harmony Books, 1997.

MLA (9th ed.) Citation

Gould, Stephen Jay. Questioning the Millennium: A Rationalist's Guide to a Precisely Arbitrary Countdown. Harmony Books, 1997.