Dyfyniad APA

(2007). Public relations: The profession and the practice. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Public Relations: The Profession and the Practice. New York: McGraw-Hill, 2007.

Dyfyniad MLA

Public Relations: The Profession and the Practice. New York: McGraw-Hill, 2007.

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