Provine, Robert R. <br/><br/>
Laughter : a scientific investigation 

 - New York:  Penguin,  2000. 
<br/><br/><label>ISBN: </label>9780141002255 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Laughter -- Psychological aspects
<br/><br/><label>Dewey Class. No.: </label>152.4