Gostick, Adrian Robert. <br/><br/>
The levity effect :  why it pays to lighten up / 
Adrian Gostick and Scott Christopher. 
 - Hoboken, N.J. :  John Wiley & Sons,  c2008. 
 - viii, 229 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>9780470195888 (cloth) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humor in the workplace.