Gillis, L. (1966). 70 progressive studies for the modern bass trombonist. Bravo Music.
Čikaški stil citiranja (17. izdanje)Gillis, Lew. 70 Progressive Studies for the Modern Bass Trombonist. Hammond, L.A: Bravo Music, 1966.
MLA način citiranja (9. izdanje)Gillis, Lew. 70 Progressive Studies for the Modern Bass Trombonist. Bravo Music, 1966.
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