Brualdi. Richrd A <br/><br/>
Introductory combinatorics 
by Richrd A Brualdi 
 - 4th. ed. 
 - New Delhi  Pearson  2004 
 - ix, 630p. 
<br/><br/><label>ISBN: </label>9788131718827 
<br/><br/><label>Dewey Class. No.: </label>511.6  / P042 (CSA)