Riandari, F., and H. Fahmi. “Rekayasa Perangkat Lunak: ISBN : 9786025193637 Authors : Fristi Riandari, Hasanul Fahmi Publisher : CV. Rudang Mayang Medan | 2019”. Rudang Mayang Publisher, no. Tahun, Mar. 2019, pp. 1-108 Halaman, https://iocscience.org/ejournal/index.php/rm/article/view/820.