Castillo, Leticia L. <br/><br/>
College algebra and trigonometry / 
Leticia L. Castillo. 
 - Mandaluyong City :  National Book Store,  2008. 
 - viii, 772 p.: 25.4 cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>971-08-6798-9 
<br/><br/><label>LC Class. No.: </label>511.1 C11d