Pope Benedict XVI - Letter to the Bishops on the Motu Proprio
Benedict XVI - Apostolic Letter Ecclesiae Unitatem
5. Sacrosanctum Concilium, Dogmatic Constitution on the Sacred Liturgy
Second Vatican Council, 4 December 1963.
Quattuor Abhinc Annos - Indult for Use of the Roman Missal of 1962
Congregation for Divine Worship, 3 October 1984.
Apostolic Letter Ecclesia Dei, Pope John Paul II, 2
Other Documents & Resources
of the Vatican Press Office
Q&A on the
Apostolic Letter Summorum Pontificum
which celebrate the Extraordinary Form of the Roman Rite
Tutorial on the Extraordinary Form (St. John Cantius, Chicago)
5. Extraordinary Form
Workshops for Priests (Priestly Fraternity of St. Peter)