Berman, Gerald. <br/><br/>
Introduction to combinatorics / 
by Gerald Berman and K. D. Fryer. 
 - New York :  Academic Press,  1972. 
 - xiii, 300 p. :  ill. ;  24 cm. 
<br/><br/> With answers to selected exercises. 
<br/><br/>Index. 
<br/><br/><label>ISBN: </label>0120927500 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Combinatorial analysis.