Listiana, L., and S. M. Alhabshi. “WAQF AND LEGACY OF ALTRUISM IN SINGAPORE: CHALLENGES AND DEVELOPMENT”. Jurnal Ekonomi Dan Bisnis Islam (Journal of Islamic Economics and Business), vol. 6, no. 1, June 2020, pp. 116-33, doi:10.20473/jebis.v6i1.19736.