Dyfyniad APA

(1964). Social progress through social planning. New York: International conference of Social work.

Dyfyniad Arddull Chicago

Social Progress Through Social Planning. New York: International conference of Social work, 1964.

Dyfyniad MLA

Social Progress Through Social Planning. New York: International conference of Social work, 1964.

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