- Abbaye Saint-Pierre de Solesmes
- American Musicological Society
- Centre Pompidou, Paris
- Early Music Online (The British Library - Royal Holloway University of London)
- Hofmeister XIX
- IAML Italia
- ITMI (Indici della Trattatistica Musicale Italiana)
- Mary Kay Duggan, Italian Music Incunabula
- Monumenta Musicae Byzantinae (University of Copenhagen)
- Music Library Association (MLA) Clearinghouse
- The Düben Collection Database Catalogue
- Vatican exibition: the music Hall