Johnston, C.L. <br/><br/>
Essential algebra / 
C.L. Johnston, Alden T. Willis, Gale M. Hughes. 
 - 4th ed. 
 - Belmont, Calif. :  Wadsworth,  c1985. 
 - 600 p. :  ill. ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0534050220 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra.