APA (7th ed.) Citation

Zuckerman, B., & Hart, M. H. (1995). Extraterrestrials--where are they? (2nd ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Zuckerman, Ben, and Michael H. Hart. Extraterrestrials--where Are They? 2nd ed. Cambridge ; New York: Cambridge University Press, 1995.

MLA (9th ed.) Citation

Zuckerman, Ben, and Michael H. Hart. Extraterrestrials--where Are They? 2nd ed. Cambridge University Press, 1995.