Purves, W. K. (2001). Life: The science of biology (6th ed.). Sinauer Associates.
Lua i Stíl Chicago (17ú heag.)Purves, William K. Life: The Science of Biology. 6th ed. Sunderland, MA: Sinauer Associates, 2001.
Lua MLA (9ú heag.)Purves, William K. Life: The Science of Biology. 6th ed. Sinauer Associates, 2001.
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