Osborn, M. (1988). Public speaking. Houghton Mifflin Co..
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Dyfyniad Arddull Chicago
Osborn, Michael. Public Speaking. Boston: Houghton Mifflin Co., 1988.
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Dyfyniad MLA
Osborn, Michael. Public Speaking. Houghton Mifflin Co., 1988.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.