Bussler, L. (1890). Elements of notation and harmony. G.Schirmer.
Chicago-čujuhus (17. p.)Bussler, Ludwig. Elements of Notation and Harmony. Nueva York: G.Schirmer, 1890.
MLA-čujuhus (9. p.)Bussler, Ludwig. Elements of Notation and Harmony. G.Schirmer, 1890.
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