College Algebra / 
Larson Ron , Robert Hostetler . 
 - 7th ed. 
 - Boston :  Houghton Mifflin Company ,  2007. 
 - xvii,678,199, p.:  ill.; 
<br/><br/><label>ISBN: </label>9780618643110 
<br/><br/><label>LC Class. No.: </label>QA154.2  / .L37  2007