Harder, P. O., & Steinke, G. A. (1998). Harmonic materials in tonal music: A programed course (8th ed.). Allyn and Bacon.
Chicago-viite (17. p.)Harder, Paul O., ja Greg A. Steinke. Harmonic Materials in Tonal Music: A Programed Course. 8th ed. Boston: Allyn and Bacon, 1998.
MLA-viite (9. p.)Harder, Paul O., ja Greg A. Steinke. Harmonic Materials in Tonal Music: A Programed Course. 8th ed. Allyn and Bacon, 1998.
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