Istan, Muhammad, and Mochammad Fahlevi. “The Effect of External and Internal Factors on Financial Performance of Islamic Banking”. Jurnal Ekonomi & Studi Pembangunan 21, no. 1 (April 29, 2020): 137–145. Accessed May 10, 2025. https://journal.umy.ac.id/index.php/esp/article/view/8047.