Creswell, J. W. Educational research: Planning, conducting, and evaluating quantitative and qualitative.
Lua i Stíl Chicago (17ú heag.)Creswell, J. W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative.
Lua MLA (8ú heag.)Creswell, J. W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative.
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