Riddle, Douglas R. <br/><br/>
Analytic geometry / 
Douglas R. Riddle. 
 - 6th edition, Philippine edition. 
 - Andover :  Cengage Learning,  c2009 [2012] 
 - xvii, 473 pages :  illutrations ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>978-981-265-767-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Analytic geometry.