Skowroneck 2002, p. 523. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Skowroneck 2002, pp. 530–531. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Skowroneck 2002, p. 522. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Winston 1993. Winston, David (1993). "The Restoration of Beethoven's 1817 Broadwood Grand Piano". The Galpin Society Journal. 46: 147–151. doi:10.2307/842353. JSTOR842353.
Skowroneck 2002, p. 523. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Skowroneck 2002, pp. 530–531. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Skowroneck 2002, p. 522. Skowroneck, Tilman (2002). "Beethoven's Erard Piano: Its Influence on His Compositions and on Viennese Fortepiano Building". Early Music. 30 (4). Oxford: Oxford University Press: 522–538. doi:10.1093/em/XXX.4.523. JSTOR3519211.
Winston 1993. Winston, David (1993). "The Restoration of Beethoven's 1817 Broadwood Grand Piano". The Galpin Society Journal. 46: 147–151. doi:10.2307/842353. JSTOR842353.