Anonim. (1989). Etude (solfegio) Vocal. Oliver Ditson & Co.
Chicago Style (17th ed.) CitationAnonim. Etude (solfegio) Vocal. Oliver Ditson & Co, 1989.
MLA (8th ed.) CitationAnonim. Etude (solfegio) Vocal. Oliver Ditson & Co, 1989.
Warning: These citations may not always be 100% accurate.