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Creswell, John W. and Creswell, J. David (2018) Research Design Qualitative, Quantitative, and Mixed Methods Approaches. SAGE Publications,, California.
Creswell, John W. (2012) EDUCATIONAL RESEARCH PLANNING, CONDUCTING AND EVALUATING QUANTITATIVE AND QUALITATIVE RESEARCH. Pearson, Boston. ISBN 978-0-13-136739-5