Gupta, D. B. (1982). A Base book for viva-voce in mathematics: (post graduate classes). Kedar Nath Ram Nath.
Chicago-čujuhus (17. p.)Gupta, Dr. B.D. A Base Book for Viva-voce in Mathematics: (post Graduate Classes). Meerut: Kedar Nath Ram Nath, 1982.
MLA-čujuhus (9. p.)Gupta, Dr. B.D. A Base Book for Viva-voce in Mathematics: (post Graduate Classes). Kedar Nath Ram Nath, 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.