Kumar, R. (2014). Research Methodology (4th.). Sage.
Chicago-čujuhus (17. p.)Kumar, Ranjit. Research Methodology. 4th. New Delhi: Sage, 2014.
MLA-čujuhus (9. p.)Kumar, Ranjit. Research Methodology. 4th. Sage, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.