SINGAL, M. (1976). Sets and numbers (2nd ed.). R.Chand.
Cita Chicago (17th ed.)SINGAL, M.K. Sets and Numbers. 2nd ed. New Delhi: R.Chand, 1976.
Cita MLA (9th ed.)SINGAL, M.K. Sets and Numbers. 2nd ed. R.Chand, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.