Aldis, Owen <br/><br/>
Play fighting / 
Owen Aldis 
 - New York :  Academic Press,  1975 
 - xviii, 319 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 303-311. 
<br/><br/><label>ISBN: </label>0120494507 
<br/><br/><label>LCCN: </label>74-030815 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychology, Comparative<br/>Play<br/>Fighting (Psychology)