Creswell, J. W. (2014). Research design: Qualitative, Quantitative, and mixed methods approaches (4ª edición.). SAGE.
Chicago-čujuhus (17. p.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 4ª edición. Thousand Oaks, CA: SAGE, 2014.
MLA-čujuhus (9. p.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 4ª edición. SAGE, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.