Dyfyniad APA
Vitkus, J. (1993). Casebook in abnormal psychology (2nd ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Vitkus, John. Casebook in Abnormal Psychology. 2nd ed. New York: McGraw-Hill, 1993.
Dyfyniad MLA
Vitkus, John. Casebook in Abnormal Psychology. 2nd ed. McGraw-Hill, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.