Salas, Saturnino L. <br/><br/>
Precalculus :  a short course / 
Saturnino L. Salas, Charles G. Salas. 
 - Lexington, Mass :  Xerox College Pub. ,  1975. 
 - xi, 289 p. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0536010498 
<br/><br/><label>LCCN: </label>74-83347