APA
Purves W. K., . (2004). Life, the science of biology. Sunderland, Mass: Sinauer Associates.
Chicago
Purves William K, . 2004. Life, the science of biology. Sunderland, Mass: Sinauer Associates.
Harvard
Purves W. K., . (2004). Life, the science of biology. Sunderland, Mass: Sinauer Associates.
MLA
Purves William K, . Life, the science of biology. Sunderland, Mass: Sinauer Associates. 2004.