เกิดทรัพย์ ว. The Development of Supplementary English Lessons of Tour Guides for Fourth Year Students in Majoring of Hotel and Tourism Management at Rajapruk University (Phuket Center). rpujournal [internet]. 2016 May 31 [cited 2025 Apr. 14];2(1):123-34. available from: https://so03.tci-thaijo.org/index.php/rpu/article/view/112398