Evolution of play behavior / 
edited by Dietland M uller-Schwarze 
 - Hutchinson & Ross, Stroudsburg, Pa. :  Dowden,  1978 
 - xiii, 396 p. :  ill,  26 cm. 
 - Benchmark papers in animal behavior  10 .
<br/><br/>Includes bibliographies and indexes 
<br/><br/><label>ISBN: </label>0879332727 
<br/><br/><label>LCCN: </label>77-2385 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Play<br/>Psychology, Comparative