TRAIPAK, A.; SITTILERD, S. Learning Achievement of Writing Skills on Diphthong (ร หัน) by Using Instructional Package for Grade 3 Students of Settabutr Upathum School. Rajapark Journal, Bangkok, Thailand, v. 14, n. 32, p. 37–49, 2020. Disponível em: https://so05.tci-thaijo.org/index.php/RJPJ/article/view/193780. Acesso em: 29 mar. 2024.