delson, D. A., and M. Ridho. “RANCANG BANGUN PENJUALAN LISENCE KEY BERBASIS WEB PADA PT GFSOFT INDONESIA”. Computer and Science Industrial Engineering (COMASIE), vol. 6, no. 2, Jan. 2022, pp. 32-39, https://ejournal.upbatam.ac.id/index.php/comasiejournal/article/view/5051.