These sources may list articles not listed in BartonPlus:
Many print-only dictionaries, indexes, and thematic catalogs are available in the library.
For print-only indexes and bibliographies, look in the Lewis Music Library's Ref ML128 section.
For thematic catalogs listing composers’ works, look in Ref ML134, arranged alphabetically by composer.
Writing guides for music: see the Ref ML3797 section in the library