Strouse, C. (2004). Once upon a time: For SSAA a cappella. Hal Leonard.
Lua i Stíl Chicago (17ú heag.)Strouse, Charles. Once upon a Time: For SSAA a Cappella. Milwaukee, Wis: Hal Leonard, 2004.
Lua MLA (9ú heag.)Strouse, Charles. Once upon a Time: For SSAA a Cappella. Hal Leonard, 2004.
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