Congregation for Divine Worship and the Discipline of the Sacraments, Decree elevating the rank of the celebration of the Immaculate Heart of the Blessed Virgin Mary in the General Roman Calendar from an optional memorial to an obligatory memorial, 1 January 1996.

Bishops’ Committee on the Liturgy, Thirty-Five Years of the BCL Newsletter: 1965-2000 (Washington, DC: United States Conference of Catholic Bishops, 2004):1539-1541.