Wallis, W. D. <br/><br/>
Introduction to combinatorics / 
W. D. Wallis, J. C. George 
 - Boca Raton :  Chapman & Hall/CRC,  c2010 
 - xvi, 380 p. :  ill. ;  24 cm. 
 - Discrete mathematics and its applications .
 - Discrete mathematics and its applications .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781439806227 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Combinatorial analysis--Textbooks