Hasanah, Fitria Nur, and Cindy Taurusta. “Modul Pemrograman Berorientasi Objek”. Umsida Press (August 29, 2021): 1-80. Accessed August 10, 2022. https://press.umsida.ac.id/index.php/umsidapress/article/view/978-602-5914-58-4.