Ford Lumban Gaol; Fonny Hutagalung; Chew Peng <br/><br/>
Issues and Trends in Interdisciplinary Behavior and Social Science  Proceedings of the 6th International Congress on Interdisciplinary Behavior and Social Sciences (ICIBSoS 2017), July 22-23, 2017, Bali, Indonesia 

 -  Taylor and Francis  2018 
<br/><br/><label>ISBN: </label>9781315148700 
<br/><br/><label>Source: </label>EBOOK