Purves, W. K. (1998). Life: The science of biology (5th ed.). Sinauer Associates W.H. Freeman.
Citazione stile Chigago Style (17a edizione)Purves, William K. Life: The Science of Biology. 5th ed. Sunderland, MA, Salt Lake City, Utah: Sinauer Associates W.H. Freeman, 1998.
Citatione MLA (9a ed.)Purves, William K. Life: The Science of Biology. 5th ed. Sinauer Associates W.H. Freeman, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.