Dyfyniad APA

(1956). Social work. New York, N.Y.: National Association of Social Workers.

Dyfyniad Arddull Chicago

Social Work. New York, N.Y.: National Association of Social Workers, 1956.

Dyfyniad MLA

Social 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.