Muslim Marpaung, and Irma Suryani Lubis. “Strategy of the Indonesian Waqf Agency, North Sumatra Representative Office in Increasing the National Waqf Index”. El-Qish: Journal of Islamic Economics 4, no. 2 (November 13, 2024). Accessed January 13, 2026. https://jurnal.ut.ac.id/index.php/elqish/article/view/10431.