Citazione Stile APA (7a Edizione)

Corey, G. (1990). Theory and practice of group counselling (3rd ed.). Brooks/Cole Publishing.

Citazione stile Chigago Style (17a edizione)

Corey, Gerald. Theory and Practice of Group Counselling. 3rd ed. California.: Brooks/Cole Publishing, 1990.

Citatione MLA (9a ed.)

Corey, Gerald. Theory and Practice of Group Counselling. 3rd ed. Brooks/Cole Publishing, 1990.