H. Fitriansyah, N. V. N. Rukmini, and S. Al Hakim, “The Transformation of the Refund Provisions of Tabarru’ in Islamic Insurance: Fatwa DSN-MUI No. 53/2006 and No. 81/2011”, Al-Muamalat J. Ekon. Syariah, vol. 12, no. 1, pp. 18–38, Mar. 2025.