Singal, M. K. and Gupta, J. D. <br/><br/>
An approach to numbers  An approach to numbers, Delhi : R. Chand & Company, 1990 
M. K. Singal and J. D. Gupta 
 - Delhi  R. Chand & Company  1990 
<br/><br/><label>Dewey Class. No.: </label>512.81