Sheftel, P. (1970). Exploring keyboard fundamentals. Holt, Rinehart.
Lua i Stíl Chicago (17ú heag.)Sheftel, Paul. Exploring Keyboard Fundamentals. New York: Holt, Rinehart, 1970.
Lua MLA (9ú heag.)Sheftel, Paul. Exploring Keyboard Fundamentals. Holt, Rinehart, 1970.
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