Riyanto, R., M. Aman, B. Tiara, N. Wiyono, and Y. Nugroho. “Development of Coronavirus Disease Patient Registration Information System With Object Oriented System Approach”. Journal of Information Systems and Informatics, Vol. 3, no. 4, Dec. 2021, pp. 724-39, doi:10.51519/journalisi.v3i4.195.