Waduangsri, Supaporn. 2023. “The development of ability and satisfaction in learning about pronunciation words diphthongs by using to pronunciation skill in Thai language with lt technique of prathom suksa 4 students”. Journal for Developing the Social and Community 10 (1). Bangkok, Thailand:517-24. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/261303.