* Psallite! Musica e Liturgia, link: http://new.psallite.net/a/La_Veglia_di_Natale_il_canto_della_Kalenda/4/3
* GregoBase project, https://gregobase.selapa.net/
* CattoliciRomani.com, link: https://www.cattoliciromani.com/16-liturgia/3491-santa-messa-di-natale-vigilia-notte-aurora-giorno-kalenda/?page=37
== Note ==