An index of Gregorian chant - Bryden, John R. (John Rennie), 1913-2001.; Hughes, David G (Cambridge, Harvard University Press, 1969)
v. 1. Alphabetical index.--v. 2. Thematic index.
Bibliography: v. 1, p. xiii-xv.
Keywords: Gregorian chants -- Indexes; Gregorian chants -- Thematic catalogs