ตันจันทร์พงศ์ ภ. (2018) “Variations in Beethoven’s Piano Repertoire: Performance and Analytical Notes”, Rangsit Music Journal, 12(2), pp. 103–110. available at: https://so06.tci-thaijo.org/index.php/rmj/article/view/126438 (accessed: 12 September 2026).