Dyfyniad APA
Davidson, G. C., & Nearle, J. M. (1990). Abnormal psychology (5th ed.). John Wiley & Sons.
Dyfyniad Arddull Chicago
Davidson, Gerald C., and John M. Nearle. Abnormal Psychology. 5th ed. New York: John Wiley & Sons, 1990.
Dyfyniad MLA
Davidson, Gerald C., and John M. Nearle. Abnormal Psychology. 5th ed. John Wiley & Sons, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.