ISTIATIN, Istiatin. Increasing the Customer Retention Rate with Digital Banking Performance Optimization during the Covid-19 Pandemic (Study at BMT Amanah Ummah in Kartasura, Sukoharjo). International Journal of Economics, Business and Accounting Research (IJEBAR), [S. l.], v. 5, n. 3, p. 2635–2643, 2021. DOI: 10.29040/ijebar.v5i3.3389. Disponível em: https://www.jurnal.stie-aas.ac.id/index.php/IJEBAR/article/view/3389. Acesso em: 1 jul. 2025.