Heddens, James W., <br/><br/>
Today's mathematics :  concepts and methods in elementary school mathematics. 

 - 6th ed. / 
 - Chicago :  Science Research Associates,  c1988. 
 - vi, 677 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0574231307 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>372.7