Ikhwan, Ihsanul, and Ririn Riani. “The Efficiency Level of Indonesian Banks in the Covid-19 Pandemic Era and Its Determinant”. Jurnal Ekonomi & Keuangan Islam 8, no. 2 (August 3, 2022): 221–235. Accessed May 5, 2024. https://journal.uii.ac.id/JEKI/article/view/22096.