Stephenson, H. (1960). Handbook of public relations. McGraw-Hill.
Dyfyniad Arddull ChicagoStephenson, Howard. Handbook of Public Relations. New York: McGraw-Hill, 1960.
Dyfyniad MLAStephenson, Howard. Handbook of Public Relations. McGraw-Hill, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.