http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
paroles de MM. Scribe, Alph. Royer et G. de Vaëz / musique de Donizetti ; partition piano et chant.
Libretto by A. Royer, G. Vaëz and A.E. Scribe. Cf. Loewenberg. Annals of opera.