ROSEN, Charles. Beethoven's Piano Sonatas A Short Companion. [s.l.]: Yale University Press, 2002. Dostupné online. ISBN9780300090703.
gutenberg.org
BEETHOVEN, Ludwig van. Beethoven, the Man and the Artist, as Revealed in His Own Words. Příprava vydání Friedrich Kerst, Henry Edward Krehbiel. [s.l.]: [s.n.], 1905. Dostupné online.