พงษ์โสภณ จ. (2014) “คิดนอกกรอบ”, Journal of Education Studies, Chulalongkorn University. Bangkok, Thailand, 41(3), pp. 243–248. available at: https://so02.tci-thaijo.org/index.php/EDUCU/article/view/27757 (accessed: 11 September 2026).