Richards, E. (2009). Melody & Rhythm permutatios: More than 300 exercises for mallets and other instruments. Hal Leonard Corporation.
Lua i Stíl Chicago (17ú heag.)Richards, Emil. Melody & Rhythm Permutatios: More than 300 Exercises for Mallets and Other Instruments. Australia: Hal Leonard Corporation, 2009.
Lua MLA (8ú heag.)Richards, Emil. Melody & Rhythm Permutatios: More than 300 Exercises for Mallets and Other Instruments. Hal Leonard Corporation, 2009.
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