A. G. E. Kusumaningrat and A. I. A. Maheswari, “Analisa Pembelian Kebutuhan Produk Pencegahan Covid-19 Oleh Instansi Non Pelayanan Kesehatan Pada PT. Ersa Prima Medika: Purchase Analysis Of Covid-19 Prevention Products By Non Medical Services Institution In PT. Ersa Prima Medika”, Anterior J, vol. 20, no. 1, pp. 102–107, Dec. 2020.