Chooma, T. ., and S. . Posai. “DEVELOPMENT OF ENGLISH COMMUNICATIVE INNOVATION FOR ECO-CULTURAL TOURISM IN THE HIGHLAND PEOPLE DEVELOPMENT AREA UTHAI THANI PROVINCE”. Journal of MCU Social Science Review, vol. 11, no. 1, Feb. 2022, pp. 241-54, https://so03.tci-thaijo.org/index.php/jssr/article/view/255554.