Creswell,John W. (2009). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (3rd.). Sage.
Chicago-čujuhus (17. p.)Creswell,John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 3rd. New Delhi: Sage, 2009.
MLA-čujuhus (9. p.)Creswell,John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 3rd. Sage, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.