Preeyapha Wangmanee, & Apinya Jitmanowan. (2023). The Guidelines for Developing Communicative English Handbook for Elderly in the 21st Century in Muang District, Chiang Rai Province. Fa Nuea Journal, 12(1), 89–112. retrieved from https://so01.tci-thaijo.org/index.php/FaNJ/article/view/265347