Liu.L.C. <br/><br/>
Elements of discrete mathematics. 

 - New York :  MacGraw-Hill book company,  1977. 
 - ix,294 pages. 
 - (MacGraw-Hill computer science series) .
<br/><br/> Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0070381313 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Combinatorial analysis.<br/>Algebra, Abstract.