Carruthers, Elizabeth. <br/><br/>
Understanding children's mathematical graphics :  beginnings in play / 
Elizabeth Carruthers and Maulfry Worthington. 
 - Maidenhead :  Open University Press,  2011 
 - xxvii, 203 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references (p. [182]-192) and index. 
<br/><br/><label>ISBN: </label>9780335237760 (pbk.)  RM101.43 0335237762 (pbk.) 9780335237753 (hbk.) 0335237754(hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Mathematics--Study and teaching (Elementary)--Activity programs.