Helms, Donald B <br/><br/>
Exploring child behavior/ 
by Donald B Helms, Jeffrey S Turner 
 - Philadelphia:  W B Saunders Co,  1976. 
<br/><br/><label>ISBN: </label>0721646352 
<br/><br/><label>Dewey Class. No.: </label>155.4  / HEL/E