Johnson, L. G. (1983). Biology. Wm. C. Brown.
Lua i Stíl Chicago (17ú heag.)Johnson, Leland G. Biology. Dubuque, Iowa: Wm. C. Brown, 1983.
Lua MLA (9ú heag.)Johnson, Leland G. Biology. Wm. C. Brown, 1983.
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