UTHAISAR, S.; WAN-A-ROM, U.; PRAPHAN, P. Lexical Input in an ELT Course Book “Communicative English for Tourism:” a Matter of Variation, Frequency, and Coverage. วารสารมหาวิทยาลัยราชภัฏมหาสารคาม, [S. l.], v. 6, n. 3, p. 17–28, 2014. Disponível em: https://so05.tci-thaijo.org/index.php/rmuj/article/view/19223. Acesso em: 1 ต.ค. 2026.