Kimball, J. W. (1983). Biology (6th.ed.). WCB.
Lua i Stíl Chicago (17ú heag.)Kimball, John W. Biology. 6th.ed. Iowa: WCB, 1983.
Lua MLA (9ú heag.)Kimball, John W. Biology. 6th.ed. WCB, 1983.
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