- Johnson, Rebecca. "There's a new series in the music store - how do I evaluate it?" Clavier Companion. ClavierCompanion.com, September/October 2009, Vol. 1 No. 5.
- Zeigler, John M. and Nancy Ostromencki. "Piano Teaching Methods." The Piano Education Page. PianoEducation.org, updated February 7, 2010.
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