Wardani, Dewi, Maria Ulfah Siregar, Ardhi Wijayanto, and Yessi Yunitasari. “The Formal Graph of APRDF”. International Journal on Advanced Science, Engineering and Information Technology 13, no. 5 (October 31, 2023): 1615–1621. Accessed August 24, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/18438.