Müller, J. F., & Rusch, H. W. (1964). Müller-Rusch string method for class or individual instruction: Viola. Neil A. Kjos Music.
Lua i Stíl Chicago (17ú heag.)Müller, J. Frederick, agus Harold W. Rusch. Müller-Rusch String Method for Class or Individual Instruction: Viola. San Diego, CA: Neil A. Kjos Music, 1964.
Lua MLA (9ú heag.)Müller, J. Frederick, agus Harold W. Rusch. Müller-Rusch String Method for Class or Individual Instruction: Viola. Neil A. Kjos Music, 1964.
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