Ferdiansyah, D., M. I. Wahyuddin, and A. Andrianingsih. “Information System Development of Web Portalalumni National University: Information System Development of Web Portalalumni National University”. Jurnal Mantik, vol. 4, no. 1, May 2020, pp. 767-72, https://www.ejournal.iocscience.org/index.php/mantik/article/view/850.