Combinatorial theory 
Hall, Marshall, 
 - 2nd ed. 
 - New York :  Wiley,  1983 
 - 440 p. 
 - Wiley-Interscience series in discrete mathematics .
<br/><br/> A Wiley-Interscience publication." | Includes index." 
<br/><br/><label>ISBN: </label>0471091383 | 9788126549443