Singhal, O. (1994). Tippan,Prarupan tatha pruf pathan T.Y.B.Com (2nd.). Pitambar.
Chicago-čujuhus (17. p.)Singhal, Omprakash. Tippan,Prarupan Tatha Pruf Pathan T.Y.B.Com. 2nd. New delhi: Pitambar, 1994.
MLA-čujuhus (9. p.)Singhal, Omprakash. Tippan,Prarupan Tatha Pruf Pathan T.Y.B.Com. 2nd. Pitambar, 1994.
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