Willoughby, D. (2007). The world of music (6th ed.).
Chicago Style aipamenaWilloughby, David. The World of Music. 6th ed. New York, N.Y. ; McGraw-Hill, 2007.
MLA aipamenaWilloughby, David. The World of Music. 6th ed. 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.