Romberg, B. (1948). Duet no.1 in D major - opus 9, for two cellos. Ed. by F. Gruetzmacher. International Music.
Citace podle Chicago (17th ed.)Romberg, Bernhard. Duet No.1 in D Major - Opus 9, for Two Cellos. Ed. by F. Gruetzmacher. New York: International Music, 1948.
Citace podle MLA (9th ed.)Romberg, Bernhard. Duet No.1 in D Major - Opus 9, for Two Cellos. Ed. by F. Gruetzmacher. International Music, 1948.
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