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Dyfyniad Arddull ChicagoAmerican Psychological Association. Division of School Psychology. School Psychology Quarterly: The Official Journal of the Division of School Psychology, American Psychological Association. New York: Guilford Press, 1990.
Dyfyniad MLAAmerican Psychological Association. Division of School Psychology. School Psychology Quarterly: The Official Journal of the Division of School Psychology, American Psychological Association. Guilford Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.