Hornsby, John <br/><br/>
A graphical approach to precalculus limits: a unit circle approach 
John Hornsby, Margret Lial, Gary K. Rockswold 
 - \\  4th ed. 
 -  Pearson Addison wesley  2007 
 - xix., 1003p.: ill 
<br/><br/><label>ISBN: </label>321356969