Dyfyniad APA

Corey, G., & Corey, M. S. (1992). Group techniques (2nd ed.). Brooks / Cole.

Dyfyniad Arddull Chicago

Corey, Gerald, and Marianne S. Corey. Group Techniques. 2nd ed. California: Brooks / Cole, 1992.

Dyfyniad MLA

Corey, Gerald, and Marianne S. Corey. Group Techniques. 2nd ed. Brooks / Cole, 1992.

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