Liu, C.L. <br/><br/>
Elements of Discrete Mathematics 

 - 2nd ed. 
 -  Tata McGraw-Hill Publishing Company Ltd., New Delhi  2002 
 - xiv, 433 
<br/><br/><label>ISBN: </label>9780070434769 
<br/><br/><label>Dewey Class. No.: </label>Column-20