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Creswell, John W.. (2003). Research design: qualitative, quantitative, and mixed methods approaches (2). Thousand Oaks, California: SAGE Publications Inc..

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Creswell, John W.. Research design: qualitative, quantitative, and mixed methods approaches. 2 Thousand Oaks, California: SAGE Publications Inc., 2003. Text.

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Creswell, John W.. Research design: qualitative, quantitative, and mixed methods approaches. 2 Thousand Oaks, California: SAGE Publications Inc., 2003. Text.

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Creswell, John W.. Research design: qualitative, quantitative, and mixed methods approaches. 2 Thousand Oaks, California: SAGE Publications Inc., 2003. Print.