Sopa N, Sirisom P, Jampeehom K. English Language Competency Development of Tour Guides in Maha Sarakham Province in Preparation for the ASEAN Community by Integrating Three Concept-Centered Instructional Models and Using English in Actual Situations. AJOPAC [Internet]. 2017 Nov. 30 [cited 2025 Jun. 30];4:95-101. Available from: https://www.ajopac.com/index.php/ajopac/article/view/40