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Dyfyniad Arddull ChicagoNebraska Symposium on Motivation, David J. Hansen, and Cathy Spatz Widom. Motivation and Child Maltreatment. Lincoln: University of Nebraska Press, 2000.
Dyfyniad MLANebraska Symposium on Motivation, et al. Motivation and Child Maltreatment. University of Nebraska Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.