Emmons R A <br/><br/>
Thanks!: how the new science of gratitude can make you happier 
Emmons R A 
 - Boston  Boston, Houghton Mifflin  2007 
 - 244p 
<br/><br/><label>ISBN: </label>978-0-618-62019-7 
<br/><br/><label>Source: </label>Textbook