https://www.newliturgicalmovement.org/2015/04/liturgies-at-sacra-liturgia-usa-2015.html
New Liturgical Movement: Liturgies at Sacra Liturgia USA 2015 - Program Announced
Sacred liturgy and liturgical arts. Liturgical history and theology. The movements for the Usus Antiquior and Reform of the Reform.
new liturgical movementsacra liturgiaprogram announcedliturgiesusa
https://oud.rkdocumenten.nl/rkdocs/index.php?mi=600&doc=1563&al=9&special=marges
Instructio de musica sacra et sacra liturgia - Over gewijde muziek en de heilige Liturgie -...
de musicagewijde muziekinstructioetliturgia