Cofnodi Dyfyniadau
Dyfyniad APA
Blumnethal, R. L. (1972). The practice of public relations. Macmillan.
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Dyfyniad Arddull Chicago
Blumnethal, Roy L. The Practice of Public Relations. New York: Macmillan, 1972.
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Dyfyniad MLA
Blumnethal, Roy L. The Practice of Public Relations. Macmillan, 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.