Helping children learn mathematics / 
Robert E. Reys ... [et al.]. 
 - 6th ed. 
 - New York :  John Wiley and Sons,  c2001. 
 - xiii, 410p. : ill. ; 28 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0471367850 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary).