Mukkhuntod W, Sawekgam W, Makanong A. THE DEVELOPMENT OF AN EMPATHY THEORY-BASED PROGRAM FOR ENHANCING VOLUNTEER BEHAVIOR AMONG UPPER SECONDARY STUDENTS . JEI [internet]. 2026 Jun. 29 [cited 2026 Sep. 12];28(2):293491 . available from: https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/293491