Dworetzky, John P <br/><br/>
Introduction to  Child Development / 
by John P. Dworetzky 
 - 2nd Ed. 
 - New York:  West Publishing,  1981 
 - p.111 
<br/><br/><label>ISBN: </label>0314779817 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychology <br/>Differential and developmental psychology<br/> Childhood
<br/><br/><label>Dewey Class. No.: </label>155.4  / DWO-I.2