(1956). Social work. New York, N.Y.: National Association of Social Workers.
Dyfyniad Arddull ChicagoSocial Work. New York, N.Y.: National Association of Social Workers, 1956.
Dyfyniad MLASocial Work. New York, N.Y.: National Association of Social Workers, 1956.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
