APA (7e ed.) Bronvermelding

Willoughby, D. (1999). The world of music (4th ed.). Mcgraw-Hill.

Chicago (17e ed.) Bronvermelding

Willoughby, David. The World of Music. 4th ed. Boston: Mcgraw-Hill, 1999.

MLA (9e ed.) Bronvermelding

Willoughby, David. The World of Music. 4th ed. Mcgraw-Hill, 1999.