APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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