Volpe, E. P. (1993). Biology and human concerns (4th ed.). Wm. C. Brown.
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Dyfyniad Arddull Chicago
Volpe, E. Peter. Biology and Human Concerns. 4th ed. Dubuque: Wm. C. Brown, 1993.
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Dyfyniad MLA
Volpe, E. Peter. Biology and Human Concerns. 4th ed. Wm. C. Brown, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.