Cita APA (7a ed.)

Ehrlich, R., & Ehrlich, R. (2005). Eight Preposterous Propositions: From the Genetics of Homosexuality to the Benefits of Global Warming (2. print., and 1. paperback print.). Princeton Univ. Press.

Cita Chicago Style (17a ed.)

Ehrlich, Robert, y Robert Ehrlich. Eight Preposterous Propositions: From the Genetics of Homosexuality to the Benefits of Global Warming. 2. print., and 1. paperback print. Princeton, NJ: Princeton Univ. Press, 2005.

Cita MLA (8a ed.)

Ehrlich, Robert, y Robert Ehrlich. Eight Preposterous Propositions: From the Genetics of Homosexuality to the Benefits of Global Warming. 2. print., and 1. paperback print. Princeton Univ. Press, 2005.