Kumar, R. Research Methodology 4th Edition. Sage India.
Chicago-čujuhus (17. p.)Kumar, Ranjit. Research Methodology 4th Edition. Sage India.
MLA-čujuhus (9. p.)Kumar, Ranjit. Research Methodology 4th Edition. Sage India.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.