Indahyanti, Uce, and Ika Ratna Indra Astutik Astutik. “Buku Ajar Pemrograman Berorientasi Objek (PBO)”. Umsida Press (November 19, 2025). Accessed November 21, 2025. https://press.umsida.ac.id/index.php/umsidapress/article/view/1531.