Brualdi,Richard A, <br/><br/>
Introductory Combinatorics 
By Richard A.Brualdi 
 - 4th Ed. /  
 -  Pearson Education  2004 
 - ix;630p. 
<br/><br/><label>ISBN: </label>978-81-317-1882-7 
<br/><br/><label>Dewey Class. No.: </label>BV  / P4