Suchitphanit, Somruedi. “An Analytical Comparison of Beethoven’s Final Three Piano Sonatas: Opp. 109, 110, 111”. Mahidol Music Journal 1, no. 2 (April 1, 2019): 52–64. accessed September 10, 2026. https://so04.tci-thaijo.org/index.php/mmj/article/view/181518.