Catholic Church. National Conference of Catholic Bishops. Bishops' Committee on the Liturgy & United States Catholic Conference. (1977). A call to prayer: The Liturgy of the hours. U.S. Catholic Conference.
Chicago-referens (17:e uppl.)Catholic Church. National Conference of Catholic Bishops. Bishops' Committee on the Liturgy och United States Catholic Conference. A Call to Prayer: The Liturgy of the Hours. Washington, DC: U.S. Catholic Conference, 1977.
MLA-referens (8:e uppl.)Catholic Church. National Conference of Catholic Bishops. Bishops' Committee on the Liturgy och United States Catholic Conference. A Call to Prayer: The Liturgy of the Hours. U.S. Catholic Conference, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.