Walborn, F. S. (1996). Process variables: Four common elements of counselling and psychotherapy. Brooks/Colege Pub.
Dyfyniad Arddull ChicagoWalborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Pacific Grove, Calif: Brooks/Colege Pub, 1996.
Dyfyniad MLAWalborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Brooks/Colege Pub, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.