Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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