Lancaster, E. L., & Renfrow, K. D. (2004). Alfred's group piano for adults: An innovative method enhanced with audio and MIDI files for practice and performance (2nd ed.). Alfred Pub.
Chicago (17e ed.) BronvermeldingLancaster, E. L., en Kenon D. Renfrow. Alfred's Group Piano for Adults: An Innovative Method Enhanced with Audio and MIDI Files for Practice and Performance. 2nd ed. Van Nuys, Calif: Alfred Pub, 2004.
MLA (9e ed.) BronvermeldingLancaster, E. L., en Kenon D. Renfrow. Alfred's Group Piano for Adults: An Innovative Method Enhanced with Audio and MIDI Files for Practice and Performance. 2nd ed. Alfred Pub, 2004.
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