A. A. Afifi, “The 5E Waqf Sustainability Framework from the Waqf Business Model (WBM)”, Perwakilan J. Gov. Dipl. Cust. Inst. Soc. Netw., vol. 4, no. 2, pp. 275–286, Aug. 2026, doi: 10.58764/j.prwkl.2026.4.199.