Dyfyniad APA

(1972). Progress in group and family therapy. Brunner/Mazel.

Dyfyniad Arddull Chicago

Progress in Group and Family Therapy. New York: Brunner/Mazel, 1972.

Dyfyniad MLA

Progress in Group and Family Therapy. Brunner/Mazel, 1972.

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