1. Bryden, John R., and David G. Hughes.An Index of Gregorian Chant. Cambridge, MA: Harvard University Press, 1969. Vol I: Alphabetical Index; Vol II: Thematic Index.
2. Randel, Don, ed.The New Harvard Dictionary of Music. Cambridge, MA: Harvard University Press, 1986.
3. Selfridge-Field, Eleanor. “Reflections on Technology and Musicology.”Acta Musicologica 62, 2–3 (1990), 302–14.