พันธ์พวง ปณิธาน. “The Analysis and the Interpretation of La Espiral Eterna which Composed by Leo Brouwer”. Rangsit Music Journal 13, no. 2 (July 9, 2018): 129–144. accessed September 11, 2026. https://so06.tci-thaijo.org/index.php/rmj/article/view/139173.