Phowong S. The Development of Audio Equipment Competency Training Board SMP 88-96, Audio Equipment Course, code of 20105-2008. JTechEE [internet]. 2024 Sep. 2 [cited 2025 Sep. 6];15(3):82-96. available from: https://so10.tci-thaijo.org/index.php/FTEJournal/article/view/1310