วัฒนากุล เ., & บุญธีรารักษ์ พ. (2018). 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(2), 133–150. https://doi.org/10.14456/pyuj.2017.16