Johnson, L. G. (1983). Biology. Wm. C. Brown.
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Dyfyniad Arddull Chicago
Johnson, Leland G. Biology. Dubuque, Iowa: Wm. C. Brown, 1983.
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Dyfyniad MLA
Johnson, Leland G. Biology. Wm. C. Brown, 1983.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.