APA (7th ed.) Citation
Harder, P. O. (1986). Basic materials in music theory: A programed course. Allyn and Bacon.
Chicago Style (17th ed.) Citation
Harder, Paul O. Basic Materials in Music Theory: A Programed Course. Boston: Allyn and Bacon, 1986.
MLA (9th ed.) Citation
Harder, Paul O. Basic Materials in Music Theory: A Programed Course. Allyn and Bacon, 1986.
Warning: These citations may not always be 100% accurate.