Johnston, C. L.  1911- <br/><br/>
Essential algebra / 
C.L. Johnston, Alden T. Willis, Jeanne Lazaris. 
 - 7th ed. 
 - Boston :  PWS,  PWS, 
 - xvii, 650, 99 p. ;  28 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0534944949 
<br/><br/><label>LCCN: </label>94011530  
<br/><br/><label>Dewey Class. No.: </label>512.9  / J72