Hasibuan, A. A., A. Triayudi, and R. T. K. Sari. “Designing Information System Of Social Media Alumni National University Based On Website: Designing Information System Of Social Media Alumni National University Based On Website”. Jurnal Mantik, vol. 4, no. 1, May 2020, pp. 701-8, https://iocscience.org/ejournal/index.php/mantik/article/view/796.