Lysna Lubis, Muhammad Agus Umar, Nadiroh,. “Environmental Altruistic Behavior of School Students in North Maluku, Indonesia”. International Journal of Advanced Science and Technology 29, no. 4s (March 19, 2020): 1612 - 1620. Accessed June 15, 2024. https://sersc.org/journals/index.php/IJAST/article/view/6942.