Kumar, R. (2005). Research Methodology: A Step-by-Step Guide for Beginners (2nd ed.). Pearson.
Chicago-čujuhus (17. p.)Kumar, Ranjit. Research Methodology: A Step-by-Step Guide for Beginners. 2nd ed. Australia: Pearson, 2005.
MLA-čujuhus (9. p.)Kumar, Ranjit. Research Methodology: A Step-by-Step Guide for Beginners. 2nd ed. Pearson, 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.