Catholic Encyclopedia: Lauds - Article on the canonical hour once known as Matins, then as Lauds, now as Morning Prayer. One of the two principal hours.
Catholic Encyclopedia: Matins - Not Morning Prayer, but a nighttime prayer, which has now been replaced by the Office of Readings.
Catholic Encyclopedia: Reform of the Roman Breviary - Article on the 1911-1913 revamping of the breviary so as to allow recitation of all of the Psalter each week. Feasts were also ranked according to liturgical importance, and some offices were no longer obligatory or were even suppressed.
An Incentive to Prayer - Essay by the late Cardinal Spellman says that the publication in English of the official prayer book of the Church offers a tremendous opportunity for anyone who wishes to grow closer to God in prayer.
Introduction to the Roman Breviary - By William J. Lallou. Written in 1950, so the four books he mentions do not correspond to the four-volume set in use today.
Laudis canticum - Apostolic Constitution, on the promulgation of the revised book of the Liturgy of the Hours, in 1970. By Pope Paul VI.
The Rule of St. Benedict - Chapters 8-20 are the liturgical code in the Rule of Benedict. On praying the hours.
"Short" Breviaries in 20th Century America - Analyzes the breviaria parva, or little hours, based on the Divine Office but adapted for the laity and "active" orders. Presented in order of appearance, compared with the complete Office.
Universalis - Source for praying the Liturgy of the Hours. Once you have entered your time zone and country, you can bookmark pages for daily prayer. (This site does not use the official Liturgy of the Hours translation due to copyright issues).
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