Jiahui, Zhang, and Watcharapong Supattarachaiwong. 2025. “[RETRACTED ARTICLE] A Compilation of Bel Canto Vocal Exercises for Middle School Students”. Journal of Buddhist Education and Research (JBER) 11 (4):641-50. https://so06.tci-thaijo.org/index.php/jber/article/view/286724.