Thümer, O. (1911). Thümer's new school of studies for the pianoforte. Augener.
Chicago-čujuhus (17. p.)Thümer, O. Thümer's New School of Studies for the Pianoforte. Londres: Augener, 1911.
MLA-čujuhus (9. p.)Thümer, O. Thümer's New School of Studies for the Pianoforte. Augener, 1911.
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