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.
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).
Catholic Encyclopedia: Canonical Hours
Essay on the practice of reciting the Divine Office according to set hours.
Catholic Encyclopedia: Divine Office
Brief essay on the historical development of the Liturgy of the Hours.
Catholic Encyclopedia: Prime
Article on the office of Prime, now suppressed.
Catholic Encyclopedia: Terce
Essay on the office of Terce, the earliest of the "little hours" in the day.
Catholic Encyclopedia: Sext
Article on the midday office.
Catholic Encyclopedia: None
Essay on the daytime hour recited in mid-afternoon.
Catholic Encyclopedia: Vespers
Historical article on Evening Prayer, one of the two principal canonical hours.
Catholic Encyclopedia: Music of Vespers
Applies especially to the cathedral Office, i.e., the Liturgy of the Hours in a parish setting.
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