Davidson, J. (2010). 31 ways speech, movement, and visual aids improve your presentation. Electronic & Database Pub.].
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Dyfyniad Arddull Chicago
Davidson, Jeff. 31 Ways Speech, Movement, and Visual Aids Improve Your Presentation. [East Rutherford, N.J.: Electronic & Database Pub.], 2010.
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Dyfyniad MLA
Davidson, Jeff. 31 Ways Speech, Movement, and Visual Aids Improve Your Presentation. Electronic & Database Pub.], 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.