Radionoff, S. L. (2008). The vocal instrument. Plural Pub..
Lua i Stíl Chicago (17ú heag.)Radionoff, Sharon L. The Vocal Instrument. San Diego, CA: Plural Pub., 2008.
Lua MLA (9ú heag.)Radionoff, Sharon L. The Vocal Instrument. Plural Pub., 2008.
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