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

 - 2nd ed. 
 - New York  McGraw-Hill  1985 
 - xiv, 433p.  21 cm. 
 - McGraw-Hill computer science series .
<br/><br/><label>ISBN: </label>0071005447 
<br/><br/><label>Dewey Class. No.: </label>511,  / D, Liu