Corey, G. (1991). Group techniques (2nd ed.). Brooks/Cole.
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Dyfyniad Arddull Chicago
Corey, Gerald. Group Techniques. 2nd ed. California: Brooks/Cole, 1991.
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Dyfyniad MLA
Corey, Gerald. Group Techniques. 2nd ed. Brooks/Cole, 1991.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.