IMPLEMENTASI METODE UP SELLING PADA SISTEM INFORMASI PENJUALAN. Jurnal Ilmiah Matrik, [S. l.], v. 20, n. 3, p. 192–198, 2019. DOI: 10.33557/jurnalmatrik.v20i3.467. Disponível em: https://journal.binadarma.ac.id/index.php/jurnalmatrik/article/view/467. Acesso em: 2 jul. 2025.