Febrianto. “The Blue Sapphire of the Mind: Notes for a Contemplative Ecology”. Veritas: Jurnal Teologi dan Pelayanan 21, no. 2 (December 31, 2022): 331–333. Accessed August 21, 2025. https://www.ojs.seabs.ac.id/index.php/Veritas/article/view/654.