Santosa, B., Nurhayati and Hidayatullah, N. 2023. Efficiency Analysis of Bank Buku 4 (Bank with Core Capital at Least Rp30 Trillion) Before and During The Covid-19 Pandemic: Efficiency Analysis of Bank Buku 4 (Bank with Core Capital at Least Rp30 Trillion) Before and During The Covid-19 Pandemic. PENANOMICS: International Journal of Economics. 2, 3 (Dec. 2023). DOI:https://doi.org/10.56107/penanomics.v2i3.149.