Animal play : evolutionary, comparative, and ecological perspectives 

 - 1st ed 
 - Cambridge:  Cambridge University Press,  1998 
 - xvi, 274 p. : ill. ; 24 cm 
<br/><br/><label>ISBN: </label>9780521583831 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Play behavior in animals
<br/><br/><label>Dewey Class. No.: </label>591.563 BEK