“Leveraging Waqf and Endowment for Sustainable Pesantren Development in Sumatra: Evidence from Pondok Modern Cahaya Al-Qur’an (PMCA) and the Emerging Productive Pesantren Ecosystem in Dumai, Indonesia” (2026) Proceeding of International Conference on Pesantren (ICOP), 3(1). doi:10.61159/91rt5q64.