Leedy, P. D. (2005). Practical research: Planning and design (8th ed.). Pearson.
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Dyfyniad Arddull Chicago
Leedy, Paul D. Practical Research: Planning and Design. 8th ed. New Jersey : Upper Saddle River: Pearson, 2005.
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Dyfyniad MLA
Leedy, Paul D. Practical Research: Planning and Design. 8th ed. Pearson, 2005.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.