Lakhamja , R. and Tachom, K. (2020) “The Development of English Speaking Skills Using the Triangulation Teaching Techniques for Thai EFL Students: Preliminary Results”, Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal. Nakhon Sawan, Thailand, 6(2), pp. 39–60. available at: https://so05.tci-thaijo.org/index.php/hssnsru/article/view/240726 (accessed: 29 September 2026).