Maukar, Anastasia Lidya, Dewa Anggara Kesuma, and Anang Aris Widodo. “Application of Waterfall-System Development Life Cycle Methodology for Designing Purchase Order Material Control System ”. Inform : Jurnal Ilmiah Bidang Teknologi Informasi dan Komunikasi 8, no. 2 (May 22, 2023): 102-110. Accessed May 3, 2024. https://ejournal.unitomo.ac.id/index.php/inform/article/view/5138.