Corey, G. (1991). Manual for theory and practice of counselling and psychotherapy (4th ed.). Brooks/cole.
Dyfyniad Arddull ChicagoCorey, Gerald. Manual for Theory and Practice of Counselling and Psychotherapy. 4th ed. California: Brooks/cole, 1991.
Dyfyniad MLACorey, Gerald. Manual for Theory and Practice of Counselling and Psychotherapy. 4th ed. Brooks/cole, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.