กันจินะ ย. Politeness strategies in informal memorandum. Journal of Language and Culture, Nakhon Pathom, Thailand, v. 37, n. 2, p. 35–60, 2018. Disponível em: https://so03.tci-thaijo.org/index.php/JLC/article/view/209520. Acesso em: 11 dec. 2025.