Cita APA

Purves, W. K., & Orians,Gordon H. (1987). Life: The science of biology (2nd ed.). Sinauer.

Citación estilo Chicago

Purves, William K., and Orians,Gordon H. Life: The Science of Biology. 2nd ed. Massachusetts: Sinauer, 1987.

Cita MLA

Purves, William K., and Orians,Gordon H. Life: The Science of Biology. 2nd ed. Sinauer, 1987.

Warning: These citations may not always be 100% accurate.