Creswell, J. W., & Creswell,David J. (2023). Research design: Qualitative, quantitative, and mixed methods approaches (6th.). Sage.
Lua i Stíl Chicago (17ú heag.)Creswell, John W., agus Creswell,David J. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 6th. Los angeles: Sage, 2023.
Lua MLA (9ú heag.)Creswell, John W., agus Creswell,David J. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 6th. Sage, 2023.
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