APA (7th ed.) Citation

Purves, W. K., Sadava, D., Orians, G. H., & Helen, C. H. (2001). Life: The science of biology (Sixth edition.). Sinauer.

Chicago Style (17th ed.) Citation

Purves, William K., David Sadava, Gordon H. Orians, and Craig H. Helen. Life: The Science of Biology. Sixth edition. Sunderland, Massachusetts: Sinauer, 2001.

MLA (9th ed.) Citation

Purves, William K., et al. Life: The Science of Biology. Sixth edition. Sinauer, 2001.