Kumar, R. (2011). Research Methodology (3rd ed.). Sage.
Chicago-čujuhus (17. p.)Kumar, Ranjit. Research Methodology. 3rd ed. New Delhi: Sage, 2011.
MLA-čujuhus (9. p.)Kumar, Ranjit. Research Methodology. 3rd ed. Sage, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.