Cutlip, Scott M., author
Prentice Hall International, 2000
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Smith, Ronald D., author
Lawrence Erlbraum Associates, Publishers, 2005
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Smith, Ronald D., author
Lawrence Erlbraum Associates, Publishers, 2005
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Lwin, May, author
Bhuana ilmu populer, 2005
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Firsan Nova, author
Rajawali, 2011
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