Farandy, Alan Ray, Demas Asfario Suwito, and Lila Kondi Dabutar. 2017. “Efficiency of Islamic Banks in Indonesia: Data Envelopment Analysis”. International Journal of Economics, Management and Accounting 25 (2):337-54. https://journals.iium.edu.my/enmjournal/index.php/enmj/article/view/463.