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Dyfyniad Arddull ChicagoDavidaff, Linda. Introduction to Psychology. 2.nd ed. McGraw-Hill International, 1981.
Dyfyniad MLADavidaff, Linda. Introduction to Psychology. 2.nd ed. McGraw-Hill International, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.