DUDLEY, Underwood <br/><br/>
Elementary Number Theory 

 - 2nd ed. 
 - San Francisco.  W.H. Freeman, US  1978 
 - ix, 249p; 
<br/><br/><label>ISBN: </label>0-7167-0076-X 
<br/><br/><label>Dewey Class. No.: </label>512.72;