Consumer’s Buying Decision-Making Process in E-Commerce Nia Budi Puspitasari, Susatyo Nugroho W P, Deya Nilan Amyhorsea and Aries Susanty E3S Web Conf., 31 (2018) 11003 Published online: 21 February 2018 DOI: 10.1051/e3sconf/20183111003