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Dyfyniad Arddull ChicagoHull, Elaine M., Robert Eaton, James W. Kalat, and Vicki Reardin. Biological Psychology. 3rd ed. Belmont: Wadsworth, 1988.
Dyfyniad MLAHull, Elaine M., et al. Biological Psychology. 3rd ed. Wadsworth, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.