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Dyfyniad Arddull ChicagoPrimack, Richard B; Author. A Primer of Conservation Biology. 4th ed. Sunderland, Sinauer Associates, Inc, 2008.
Dyfyniad MLAPrimack, Richard B; Author. A Primer of Conservation Biology. 4th ed. 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.