“Pedal, Trills, Extending the Keyboard.” Beethoven's Piano Sonatas: A Short Companion, by Charles Rosen, Yale University Press, New Haven; London, 2002, pp. 107–120, www.jstor.org/stable/j.ctt5vm67n.9. Accessed 4 Aug. 2021.
Rosen, C. (2002). Pedal, trills, extending the keyboard. In Beethoven's Piano Sonatas: A Short Companion (pp. 107-120). New Haven; London: Yale University Press. Retrieved August 4, 2021, from http://www.jstor.org/stable/j.ctt5vm67n.9
Rosen, Charles. "Pedal, Trills, Extending the Keyboard." In Beethoven's Piano Sonatas: A Short Companion, 107-20. New Haven; London: Yale University Press, 2002. Accessed August 4, 2021. http://www.jstor.org/stable/j.ctt5vm67n.9.
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