Enumerative combinatorics, Vol. 1  
Stanley, Richard P., 
 - 2nd ed. 
 - Cambridge, NY :  Cambridge University Press,  2012 
 - xiii, 626 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9781107015425 (hardback) | 9781107602625 (paperback)