Nc 4 / 1970 Beet
Schollum, Robert: Anmerkungen zur Liedgestaltung bei Beethoven / Robert Schollum. – 1970. – Notenbeisp.
In: Beethoven-Almanach 1970 / Isolde Ahlgrimm ... – Wien : Verlag Elisabeth Lafite, 1970. – S. 60-66
Inv.-Nr. 10585
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Nc 2 / 2000 Stan
Glauert, Amanda: Beethoven's songs and vocal style / Amanda Glauert. – 2000. – Notenbeisp.
In: The Cambridge companion to Beethoven / ed. by Glenn Stanley. – Cambridge : University Press, 2000. – (Cambridge companions to music). – S. 186-199
Inv.-Nr. 01.632