Parasian, Salomo, and Lauw Lihin. 2018. “MERANCANG SISTEM INFORMASI PENGADAAN DAN PEMBELIAN BERBASIS OBJECT ORIENTED STUDI KASUS :PT. MEGACENTRAL FINANCE”. IDEALIS : InDonEsiA JournaL Information System 1 (3), 153-58. https://jom.fti.budiluhur.ac.id/index.php/IDEALIS/article/view/531.