Steffensen,Arnold .R <br/><br/>
Introductory Algebra/ 

 - 4tch ed 
 - USA:  Harper Collins,  1991 
 - 649: 
<br/><br/><label>ISBN: </label>0673462811 
<br/><br/><label>LC Class. No.: </label>QA154.2  / S67 1991