Hadinata, Novri, Kurniawan Kurniawan, and Inggri utami. “IMPLEMENTASI METODE UP SELLING PADA SISTEM INFORMASI PENJUALAN”. Jurnal Ilmiah Matrik 20, no. 3 (January 10, 2019): 192–198. Accessed May 4, 2024. https://journal.binadarma.ac.id/index.php/jurnalmatrik/article/view/467.