Introductory Algebra :  An Applied approach / 
Aufmann Richard N . …[et.al] 
 - 7th ed 
 - Boston :  Houghton Mifflin Company ,  2006. 
 - xxxii,565 p.:  ill.; 
<br/><br/><label>ISBN: </label>0618503072 
<br/><br/><label>LC Class. No.: </label>QA152.2  / .A89 2006