พงษ์โสภณ จ. คิดนอกกรอบ. Journal of Education Studies, Chulalongkorn University, Bangkok, Thailand, v. 41, n. 3, p. 243–248, 2014. Disponível em: https://so02.tci-thaijo.org/index.php/EDUCU/article/view/27757. Acesso em: 15 sep. 2026.