Willoughby, Stephen S <br/><br/>
Real math / 
Stephen S Willoughby, Carl Bereiter, Peter Hilton, Joseph H. Rubinstein. 
 - La Salle, Ill. :  Open Court,  1981. 
 - 408 p ;  24 cm. 
<br/><br/><label>ISBN: </label>0812605047 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics