Apostolic Constitution By Which the Divine Office Restored According to the Decrees of the Second Vatican Ecumenical Council is Promulgated: Pope Paul VI, Notification on the Roman Missal, the Liturgy of the Hours and the Calendar, 1971/0624, PGEN 135/6170. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1097838 Accessed November 24, 2024.