Van der Eyken, Willem,  1933-. <br/><br/>
The pre-school years ./ 
Willem van der Eyken. 
 - Harmondsworth :  Penguin Education,  1967. 
 - 144 p. ;  19 cm. 
<br/><br/>p.139-141. 
<br/><br/><label>LCCN: </label>67-100248 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child development<br/>Education, Preschool