Librettos can be found by searching on the title of the opera and the word libretto, e.g., Don Giovanni libretto. You can also check recordings for liner notes, as many of them will include a libretto with translations.
Some key resources for librettos, aria texts, translations, and pronunciations are:
German Miscellaneous Opera Libretti, by Nico Castel
ML48 .G45 2005
Includes translations and IPA pronunciation.
French Opera Libretti (3 vols), by Nico Castel
ML48 .F875 1999
Includes translations and IPA pronunciation.
Italian belcanto opera libretti (3 vols), by Nico Castel
ML48 .I882 2000
Includes translations and IPA pronunciation.
A full text database of opera aria and art song texts with translations and pronunciation guides.
Libretti in the Music Library - a browseable list of the over 230 librettos in the Music Library. Most include translations.
| ML48 | Collections of libretti |
| ML49 | Single-composer libretti collections |
| ML50 | Individual libretti |