Piano Sonatas Nos. 13 and 14 (Beethoven) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Piano Sonatas Nos. 13 and 14 (Beethoven)" in English language version.

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2books.google.com

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books.google.com

Cooper, Barry (2017). The Creation of Beethoven's 35 Piano Sonatas. Taylor & Francis. p. 134. ISBN 131703709X.
The Beethoven Sketchbooks: History, Reconstruction, Inventory. University of California Press. 1985. p. 117. ISBN 0520048350.