Varatiporn, V., Nilnopakoon, P. and Kongthong, U. (2015) “Development of English Instructional Model for Communication of Lower Secondary School Students”, Ratchaphruek Journal, 13(1), pp. 63–70. available at: https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/240948 (accessed: 28 August 2026).