Sobel, Max A. <br/><br/>
Algebra and trigonometry :  a precalculus approach / 
Max A. Sobel, Norbert Lerner. 
 - 2nd ed. 
 - Manila :  National Book Store,  c1983. 
 - xviii, 524 p. : ill. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9710824015 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra.