Leff,Lawrance S. <br/><br/>
Barron's E-Z Precalculus 

 - New York  Barron's  2010 
 - 469p. 
<br/><br/><label>ISBN: </label>9780764144653 
<br/><br/><label>Dewey Class. No.: </label>420.76  L521B