Vittal , P. (1988). Business Mathematics. Margham.
Chicago-čujuhus (17. p.)Vittal , P. Business Mathematics. Madras: Margham, 1988.
MLA-čujuhus (9. p.)Vittal , P. Business Mathematics. Margham, 1988.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.