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Dyfyniad Arddull ChicagoHediger, Heini, Gwynne Vevers, and Winwood Reade. Man and Animal in the Zoo: Zoo Biology.
Dyfyniad MLAHediger, Heini, et al. Man and Animal in the Zoo: Zoo Biology.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.