Brualdi, Richard A. <br/><br/>
Introductory Combinatorics 

 - 4th Edn. 
 - Delhi  Pearson Education  2008 
 - ix,630p.  24cm.  PB 
<br/><br/><label>ISBN: </label>9788131718827 
<br/><br/><label>Dewey Class. No.: </label>511.6  / BRU