Berger, Jonah <br/><br/>
Contagious:  how to build word of mouth in the digital age / 
by Jonah Berger 
 - London :  Simon & Schuster,  2014. 
<br/><br/><label>ISBN: </label>9781471111709 
<br/><br/><label>Subjects--Index Terms: </label>Marketing