Creswell, J. W. 4. (1994). Research design: Qualitative and quantitative approaches. London : Sage Publications.
Chicago-čujuhus (17. p.)Creswell, John W. 401571. Research Design: Qualitative and Quantitative Approaches. London : Sage Publications, 1994.
MLA-čujuhus (9. p.)Creswell, John W. 401571. Research Design: Qualitative and Quantitative Approaches. London : Sage Publications, 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.