Cita APA (7a ed.)

Purves, W. K. (2001). Life, the science of biology (6th ed.). Sinauer Associates.

Cita Chicago Style (17a ed.)

Purves, William K. Life, the Science of Biology. 6th ed. Sunderland, MA: Sinauer Associates, 2001.

Cita MLA (9a ed.)

Purves, William K. Life, the Science of Biology. 6th ed. Sinauer Associates, 2001.