Skornicka, J. E., & Boltz, E. G. (1938). Rubank intermediate method: Trombone or baritone a follow-up course for individual or like-instrument class instruction. Rubank.
Citace podle Chicago (17th ed.)Skornicka, Joseph E., a E. G. Boltz. Rubank Intermediate Method: Trombone or Baritone a Follow-up Course for Individual or Like-instrument Class Instruction. Chicago: Rubank, 1938.
Citace podle MLA (9th ed.)Skornicka, Joseph E., a E. G. Boltz. Rubank Intermediate Method: Trombone or Baritone a Follow-up Course for Individual or Like-instrument Class Instruction. Rubank, 1938.
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