1. Digital Image Archive of Medieval Music: DIAMM.
http://www.diamm.ac.uk/index.html.
[Accessed 11-Nov-2009]
2. Avestan Digital Archive (ADA).
http://ada.usal.es/.
[Accessed 11-Nov-2009]
3. Rare Book and Manuscript Library of Columbia.
http://www.columbia.edu/cu/lweb/indiv/rbml/.
[Accessed 11-Nov-2009]
4. Gallica, bibliothèque numérique de la Bibliothèque nationale de France.
http://gallica.bnf.fr/.
[Accessed 25-Jan-2008]
5. INA, institut national de l’audiovisuel.
http://www.ina.fr/.
[Accessed: 25-Jan-2008]