Hartley, W. S. (1975). Three modes for piano. Piedmont Music.
Cita Chicago Style (17a ed.)Hartley, Walter Sinclair. Three Modes for Piano. [s.l.]: Piedmont Music, 1975.
Cita MLA (9a ed.)Hartley, Walter Sinclair. Three Modes for Piano. Piedmont Music, 1975.
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