SINg, Y. (2010). Business Mathamatics.
Chicago-čujuhus (17. p.)SINg, Y.P. Business Mathamatics. mumbai, 2010.
MLA-čujuhus (9. p.)SINg, Y.P. Business Mathamatics. 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.