APA (7e ed.) Bronvermelding

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.) Bronvermelding

Lancaster, 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.) Bronvermelding

Lancaster, 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.