== Bibliografia ==
* WikipediaLaSacraMusica.org, versione italianablogspot.com, https://itlasacramusica.wikipediablogspot.orgcom
* GregoBase project, https://gregobase.selapa.net/
* ''Graduale Romanum'', Libreria Editrice Vaticana 1974, pagina 25388.
== Note ==