Hornsby, John,  1949- <br/><br/>
A graphical approach to precalculus / 
E. John Hornsby, Jr., Margaret L. Lial. 
 - New York :  HarperCollins College Publishers,  c1996. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0673999661 
<br/><br/><label>Dewey Class. No.: </label>512.1  / H814