APA (7th ed.) Citation

Harder, P. O. (1986). Basic materials in music theory: A programed course (6th ed.). Allyn and Bacon.

Chicago Style (17th ed.) Citation

Harder, Paul O. Basic Materials in Music Theory: A Programed Course. 6th ed. Boston: Allyn and Bacon, 1986.

MLA (8th ed.) Citation

Harder, Paul O. Basic Materials in Music Theory: A Programed Course. 6th ed. Allyn and Bacon, 1986.

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