Creswell, J. W. (1994). Research design: Qualitative & quantitative approaches. Sage Publications.
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Chicago-čujuhus (17. p.)
Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Thousand Oaks, Calif.: Sage Publications, 1994.
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MLA-čujuhus (9. p.)
Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Sage Publications, 1994.
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