Yawning is catching/ 
by Beverley Burkett...(et al). 
 - Cambridge University Press  New York  c1993 
 - 16p.:  col. ill. 
<br/><br/><label>ISBN: </label>9780521578745 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Dewey Class. No.: </label>813