Helton, Floyd F. <br/><br/>
Precalculus mathematics :  a functions approach / 
by Floyd F. Helton, Margaret L. Lial. 
 - Glenview, Ill. :  Scott, Foresman and Company,  1983. 
 - xi, 514 p. 
<br/><br/><label>ISBN: </label>0673155072 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics.<br/>Functions.