1.
Amtong C. The Study of English Language Development to Promote Tourism in Phetchabun Province: A Case Study of Tourist Assistant Officers in Muang District, Phetchabun Province. LRUJ [internet]. 2023 Jul. 1 [cited 2026 Sep. 15];18(64):73-8. available from: https://so05.tci-thaijo.org/index.php/researchjournal-lru/article/view/254516