Singh, R. (2013). Marketing research. DND Publications.
Chicago-čujuhus (17. p.)Singh, Ranjit. Marketing Research. Jaipur: DND Publications, 2013.
MLA-čujuhus (9. p.)Singh, Ranjit. Marketing Research. DND Publications, 2013.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.