De Quincey, Thomas. De Quincey's Literary Criticism, edited with an introduction by H. Darbisire. London: Henry Frowde, 1909. p. 40.
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Kirkendale, Ursula (1980). "The Source for Bach's Musical Offering". Journal of the American Musicological Society. 33: 99–141. doi:10.2307/831204. JSTOR831204.
jstor.org
Kirkendale, Ursula (1980). "The Source for Bach's Musical Offering". Journal of the American Musicological Society. 33: 99–141. doi:10.2307/831204. JSTOR831204.