APA (7th ed.) Citation

Purves, W. K., Heller, H. G., & Orians, G. H. (1995). Life: The science of biology (4th edition.). W. H. Freeman.

Chicago Style (17th ed.) Citation

Purves, William K., H. Graig Heller, and Gordon H. Orians. Life: The Science of Biology. 4th edition. Sunderland: W. H. Freeman, 1995.

MLA (8th ed.) Citation

Purves, William K., et al. Life: The Science of Biology. 4th edition. W. H. Freeman, 1995.