Wongsapan, S., and S. A.- in Sitthipon Art-in. “THE DEVELOPMENT OF A SUPPLEMENTARY COURSE ENGLISH FOR CAREER TO IMPROVE SPEAKING AND ANALYTICAL THINKING ABILITIES OF GRADE 9 STUDENTS USING ACTIVITIY-BASED LEARNING WITH CONCEPT MAPPING”. Journal for Developing the Social and Community, vol. 10, no. 2, Aug. 2023, pp. 327-46, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/262947.