Clements, Douglas H. <br/><br/>
Learning and teaching early math :  the learning trajectories approach / 
Douglas H. Clements & Julie Sarama 
 - New York :  Routledge,  2009 
 - xiv, 327 p. :  ill. ;  26 cm. 
 - Studies in mathematical thinking and learning .
<br/><br/><label>ISBN: </label>9780415995917 (hardback : alk. paper)  RM424.15 9780415995924 (pbk. : alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Early childhood)<br/>Educational psychology<br/>Child development<br/>Curriculum planning