Corey, G. (2004). Group techniques (3rd ed.). Brooks/Cole-Thomson Learning.
Citazione stile Chigago Style (17a edizione)Corey, Gerald. Group Techniques. 3rd ed. Pacific Grove, Calif: Brooks/Cole-Thomson Learning, 2004.
Citatione MLA (9a ed.)Corey, Gerald. Group Techniques. 3rd ed. Brooks/Cole-Thomson Learning, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.