Sirikul, J., and S. Thuntawech. “Studying Key Factors and Models of Instruction of Vocal Music Interpretation for 9-11 Years Old Learners”. An Online Journal of Education, vol. 18, no. 1, June 2023, p. OJED1801003 (10 pages), https://so01.tci-thaijo.org/index.php/OJED/article/view/263409.