ตันจันทร์พงศ์ ภาวไล. “Variations in Beethoven’s Piano Repertoire: Performance and Analytical Notes”. Rangsit Music Journal 12, no. 2 (June 1, 2018): 103–110. accessed September 10, 2026. https://so06.tci-thaijo.org/index.php/rmj/article/view/126438.