เกตุขำ ก. Politeness Strategies and Research Paper Discussions. NIDA Journal of Language and Communication, Bangkok, Thailand, v. 18, n. 20, p. 1–8, 2016. Disponível em: https://so04.tci-thaijo.org/index.php/NJLC/article/view/47033. Acesso em: 30 sep. 2026.