Imelda Butarbutar, Riana Lumban raja, Sorta Sihombing, Sartika Maria Siregar, and Tomi Jonatan Simbolon, “Integrating Environmental Ethics into Christian Religious Education: An Analytical and Interpretive Approach through Project-Based Learning”, (IJEH), vol. 5, no. 4, pp. 698–707, Jul. 2025.