APA (7th ed.) Citation

Harder, P. O. (1990). Harmonic materials in tonal music: A programmed course (6th ed.). Allyn and Bacon.

Chicago Style (17th ed.) Citation

Harder, Paul O. Harmonic Materials in Tonal Music: A Programmed Course. 6th ed. Boston: Allyn and Bacon, 1990.

MLA (9th ed.) Citation

Harder, Paul O. Harmonic Materials in Tonal Music: A Programmed Course. 6th ed. Allyn and Bacon, 1990.

Warning: These citations may not always be 100% accurate.