วัฒนากุล เพิร์ล, and บุญธีรารักษ์ พัชร. “From Needs Analysis to Curriculum Design: The Implementation of a Self- Study ESP Curriculum to Enhance Communicative English Ability of Ticket Sellers of Public Bus Service”. PAYAP UNIVERSITY JOURNAL 27, no. 2 (January 31, 2018): 133–150. Accessed May 8, 2024. https://so05.tci-thaijo.org/index.php/pyu/article/view/123305.