• 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, Charlitos, R., Sudiono, & Thang, S. (2021). ANALISA PREDIKSI ANGKA KESEMBUHAN COVID-19 PADA BULAN APRIL 2021. Journal of Digital Ecosystem for Natural Sustainability, 1(1), 25–28. Diambil dari https://journal.uvers.ac.id/index.php/jodens/article/view/22