"Short" Breviaries in 20th Century Ameri
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.
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.
Catholic Encyclopedia: Breviary
Evolution of the book, or set of books, containing the texts and rubrics of the canonical hours.
Catholic Encyclopedia: Canonical Hours
Essay on the practice of reciting the Divine Office according to set hours.
Catholic Encyclopedia: Compline
Scholarly essay on what is essentially a bedtime prayer, often recited privately.
Catholic Encyclopedia: Divine Office
Brief essay on the historical development of the Liturgy of the Hours.
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Not Morning Prayer, but a nighttime prayer, which has now been replaced by the Office of Readings.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: Music of Vespers
Applies especially to the cathedral Office, i.e., the Liturgy of the Hours in a parish setting.
Catholic Encyclopedia: Nocturns
The convoluted history of this nighttime prayer.
Catholic Encyclopedia: None
Essay on the daytime hour recited in mid-afternoon.
Catholic Encyclopedia: Office of the Dead
Historical article on a special set of prayers for the deceased.
Catholic Encyclopedia: Prime
Article on the office of Prime, now suppressed.
Catholic Encyclopedia: Reform of the Roman Breviar
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.
Catholic Encyclopedia: Terce
Essay on the office of Terce, the earliest of the "little hours" in the day.
Catholic Encyclopedia: Vespers
Historical article on Evening Prayer, one of the two principal canonical hours.
General Instruction of the Liturgy of the Hours
http://www.catholicliturgy.com/index.cfm/FuseAction/DocumentContents/Index/2/SubIndex/39/DocumentInd
Published by the Congregation for Divine Worship in 1971.
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.
John Cassian's Institutes, Book 2
About evening and night prayer and psalmody.
John Cassian's Institutes, Book 3
About daytime prayer and psalmody in fourth-century Egyptian monasticism.
Laudis canticum
http://www.catholicliturgy.com/index.cfm/FuseAction/DocumentContents/Index/2/SubIndex/39/DocumentInd
Apostolic Constitution, on the promulgation of the revised book of the Liturgy of the Hours, in 1970. By Pope Paul VI.
Tertullian: On Prayer, Chapter 25
Demonstrates that the custom of praying at the third, sixth, and ninth hour is of very ancient origin in the Church.
The Rule of St. Benedict
Chapters 8-20 are the liturgical code in the Rule of Benedict. On praying the hours.
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).