Thirasarichote , Atchareya, and Weerachat Soopunyo. 2020. “The Participatory Development Process of a Problem-based Non-formal Learning to Enhance Restorative Conflict Resolution Skills for Juvenile in Slums”. Journal of Education Studies, Chulalongkorn University 48 (3). Bangkok, Thailand:407-27. https://doi.org/10.14456/educu.2020.41.