Creswell, J. W. (2002). Research Design: Qualitative, quantitative, and mixed methods approaches. Sage.
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Chicago-čujuhus (17. p.)
Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. London: Sage, 2002.
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MLA-čujuhus (9. p.)
Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sage, 2002.
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