Johnston, C.L. <br/><br/>
Essential arithmetic / 
C.L. Johnston ; Alden T. Willis, Jeanne Lazaris. 
 - 5th ed. 
 - 628 p ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0534090788 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra.