Sidiq, Kodrattulloh. “Human Capital Development in Islamic Education History: Environmental Value and Character Formation in Pesantren”. International Journal of Environmental, Sustainability, and Social Science (IJESSS) 7, no. 3 (May 31, 2026): 891–898. Accessed July 23, 2026. https://journalkeberlanjutan.com/index.php/ijesss/article/view/1924.