Larson, Ron,  1941- <br/><br/>
Precalculus functions and graphs :  a graphing approach / 
Ron Larson. 
 - 4th ed. 
 - Boston, MA :  Houghton Mifflin Co.,  2004. 
 - p.  cm. 
<br/><br/><label>ISBN: </label>0618394761 
<br/><br/><label>LCCN: </label>2003-113992