Saturday, D., and A. Widjaja. “RANCANG BANGUN SISTEM INFORMASI PENJUALAN BARANG PADA TOKO NEVAN HELMET”. IDEALIS : InDonEsiA JournaL Information System, Vol. 2, no. 4, July 2018, pp. 30-35, https://jom.fti.budiluhur.ac.id/index.php/IDEALIS/article/view/1320.