DeVito, J. A. (1981). The elements of public speaking. Harper & Row.
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Dyfyniad Arddull Chicago
DeVito, Joseph A. The Elements of Public Speaking. New York: Harper & Row, 1981.
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Dyfyniad MLA
DeVito, Joseph A. The Elements of Public Speaking. Harper & Row, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.