Dyfyniad APA
Carkhuff, R. R. (1983). The art of helping (5th ed.). Human Resource Development Press.
Dyfyniad Arddull Chicago
Carkhuff, Robert R. The Art of Helping. 5th ed. Amherst, Massachuttes: Human Resource Development Press, 1983.
Dyfyniad MLA
Carkhuff, Robert R. The Art of Helping. 5th ed. Human Resource Development Press, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.