Dyfyniad APA

Corey, G. (1985). Theory and practice of group counselling (2nd ed.). Brooks/Cole Publishing.

Dyfyniad Arddull Chicago

Corey, Gerald. Theory and Practice of Group Counselling. 2nd ed. California.: Brooks/Cole Publishing, 1985.

Dyfyniad MLA

Corey, Gerald. Theory and Practice of Group Counselling. 2nd ed. Brooks/Cole Publishing, 1985.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.