Stolk, A <br/><br/>
[Play of animals and its biological significance].  [electronic resource] 

 -  Tijdschrift voor ziekenverpleging  Jan 1970 
 - 21-31 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animals<br/>Behavior, Animal<br/>Play and Playthings