APA (7th ed.) Citation

Hazen, R. M., Singer, M., & Gould, S. J. (1997). Why aren't black holes black?: The unanswered questions at the frontiers of science (1st Anchor Books trade pbk. ed.). Anchor Books.

Chicago Style (17th ed.) Citation

Hazen, Robert M., Maxine Singer, and Stephen Jay Gould. Why Aren't Black Holes Black?: The Unanswered Questions at the Frontiers of Science. 1st Anchor Books trade pbk. ed. New York: Anchor Books, 1997.

MLA (9th ed.) Citation

Hazen, Robert M., et al. Why Aren't Black Holes Black?: The Unanswered Questions at the Frontiers of Science. 1st Anchor Books trade pbk. ed. Anchor Books, 1997.