Skornicka, J. E., & Boltz, E. (1939). Rubank intermediate method: [for] Eb or BBb bass : a follow-up course for individual or like-instrument class instruction. Ill. Rubank.
Chicago-referens (17:e uppl.)Skornicka, Joseph E., och E.G Boltz. Rubank Intermediate Method: [for] Eb or BBb Bass : A Follow-up Course for Individual or Like-instrument Class Instruction. Chicago: Ill. Rubank, 1939.
MLA-referens (9:e uppl.)Skornicka, Joseph E., och E.G Boltz. Rubank Intermediate Method: [for] Eb or BBb Bass : A Follow-up Course for Individual or Like-instrument Class Instruction. Ill. Rubank, 1939.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.