Suksiripakonchai, W. (2013) “ICAO Language Proficiency Requirements and Training Guidance for Thailand”, Journal of Multidisciplinary in Social Sciences. Bangkok, Thailand, 8(1), pp. 175–184. available at: https://so03.tci-thaijo.org/index.php/sduhs/article/view/5111 (accessed: 13 March 2025).