Creswell, J. W. (1994). Research design: Qualitative and Quantitative Approaches. Sage.
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Dyfyniad Arddull Chicago
Creswell, John W. Research Design: Qualitative and Quantitative Approaches. London: Sage, 1994.
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Dyfyniad MLA
Creswell, John W. Research Design: Qualitative and Quantitative Approaches. Sage, 1994.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.