Van de Walle, John A. <br/><br/>
Elementary and middle school mathematics :  teaching developmentally / 
by John A. Van de Walle. 
 - 6th ed. 
 - Boston :  Pearson /Allyn and Bacon,  c2007. 
 - xxvi, 509, [28] p. :  ill. (chiefly col ;  28 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0205493963 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Mathematics--Study and teaching (Middle school)
<br/><br/><label>Dewey Class. No.: </label>510.71