Concone, G. (1939). Fifty lessons for the voice for medium voice. G. Schirmer.
Chicago-čujuhus (17. p.)Concone, Giuseppe. Fifty Lessons for the Voice for Medium Voice. Milwaukee, WI: G. Schirmer, 1939.
MLA-čujuhus (9. p.)Concone, Giuseppe. Fifty Lessons for the Voice for Medium Voice. G. Schirmer, 1939.
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