Wongpichedchai, J., and P. . Chulapan. “Beethoven’s Piano Sonata in C Major, Op.53 ‘Waldstein’: Performance Practice and Interpretation”. Rangsit Music Journal, vol. 17, no. 1, Jan. 2022, pp. 44-57, https://so06.tci-thaijo.org/index.php/rmj/article/view/247131.