• https://www.nepjol.info/https://www.kar-group.com/https://ijssers.org/https://prodentist.ru/https://journalofmedical.org/https://schwlar.com/https://jurnal.isi-dps.ac.id/https://www.hotelconcordia.ro/https://murninetsv2.planmalaysia.gov.my/https://ojs.uph.edu/
    • Rio, F., Michael, R. Charlitos, Sudiono, dan S. Thang. “ANALISA PREDIKSI ANGKA KESEMBUHAN COVID-19 PADA BULAN APRIL 2021”. Journal of Digital Ecosystem for Natural Sustainability, vol. 1, no. 1, Juli 2021, hlm. 25-28, https://journal.uvers.ac.id/index.php/jodens/article/view/22.