Purves, W. K. (1995). Life: The Science of Biology (4th ed.). Sinauer Associates.
Chicago-čujuhus (17. p.)Purves, William K. Life: The Science of Biology. 4th ed. Massachusetts: Sinauer Associates, 1995.
MLA-čujuhus (9. p.)Purves, William K. Life: The Science of Biology. 4th ed. Sinauer Associates, 1995.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.