Willoughby, Stephen S. <br/><br/>
Real math / 
Stephen S. Willoughby. 
 - La Salle :  Open court,  c1991. 
 - 400 p. :  ill. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0812606388 
<br/><br/><label>LC Class. No.: </label>QA107  / .R43