Ford Lumban Gaol; Fonny Hutagalung <br/><br/>
Economics, Social Sciences and Information Management  Proceedings of the 2015 International Congress on Economics, Social Sciences and Information Management (ICESSIM 2015), 28-29 March 2015, Bali, Indonesia 

 -  Taylor and Francis  2015 
<br/><br/><label>ISBN: </label>9780429225826 
<br/><br/><label>Source: </label>EBOOK