APA (7th ed.) Citation

PURVES, W. K., ORIANS, G. H., & HELLER, H. (1995). Life, the science of biology.-- ed.4. Sinauer.

Chicago Style (17th ed.) Citation

PURVES, William K., Gordon H. ORIANS, and H.Craig HELLER. Life, the Science of Biology.-- Ed.4. Sunderland: Sinauer, 1995.

MLA (9th ed.) Citation

PURVES, William K., et al. Life, the Science of Biology.-- Ed.4. Sinauer, 1995.