Tupan, T., and N. R. Rosiyan. “Analysis and Visualization Data of Covid-19 Based on Scopus”. Khizanah Al-Hikmah : Jurnal Ilmu Perpustakaan, Informasi, Dan Kearsipan, Vol. 9, no. 1, June 2021, pp. 50-60, doi:10.24252/v9i1a6.