Whistler, H. S., & Hummel, H. A. (1957). Pre-ensemble folio for strings: From solo and unison playing to string ensemble performance. Rubank.
Čikaški stil citiranja (17. izdanje)Whistler, Harvey S., i Herman A. Hummel. Pre-ensemble Folio for Strings: From Solo and Unison Playing to String Ensemble Performance. Chicago: Rubank, 1957.
MLA način citiranja (9. izdanje)Whistler, Harvey S., i Herman A. Hummel. Pre-ensemble Folio for Strings: From Solo and Unison Playing to String Ensemble Performance. Rubank, 1957.
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