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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Catholic Church. National Conference of Catholic Bishops. Bishops' Committee on the Liturgy và United States Catholic Conference. A Call to Prayer: The Liturgy of the Hours. Washington, DC: U.S. Catholic Conference, 1977.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Catholic Church. National Conference of Catholic Bishops. Bishops' Committee on the Liturgy và United States Catholic Conference. A Call to Prayer: The Liturgy of the Hours. U.S. Catholic Conference, 1977.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.