Lipschutz, Semyour and Lipson, Marc <br/><br/>
Discrete Mathematics 

 - 2nd ed. 
 -  Tata McGraw-Hill Publishing Company Ltd., New Delhi  2008 
<br/><br/><label>ISBN: </label>9780070601741 
<br/><br/><label>Dewey Class. No.: </label>Column-22