Introductory Algebra :  An Applied Approach / 
Aufmann Richard ..[et..al] 
 - 5th ed. 
 - Boston :  Houghton Mifflin Company ,  1999. 
 - xxi,523 p.: 
<br/><br/><label>ISBN: </label>0395907063 
<br/><br/><label>LC Class. No.: </label>QA152.2  / .A893 1999