Parasian, S., and L. Lihin. “MERANCANG SISTEM INFORMASI PENGADAAN DAN PEMBELIAN BERBASIS OBJECT ORIENTED STUDI KASUS :PT. MEGACENTRAL FINANCE”. IDEALIS : InDonEsiA JournaL Information System, Vol. 1, no. 3, July 2018, pp. 153-8, https://jom.fti.budiluhur.ac.id/index.php/IDEALIS/article/view/531.