- Catholic Encyclopedia: Liturgical Books
 - All the books, published by the authority of any church, that contain the text and directions for her official (liturgical) services. - Catholic Encyclopedia: Liturgical Chant
- A chant, if its style, composition, and execution prove it suitable for liturgical use.
- Catholic Encyclopedia: Liturgy
- Greek composite word meaning originally a public duty, a service to the state undertaken by a citizen.
- Catholic Liturgical Library
- Includes texts, law, music, and articles.
- Liturgy Office of the Archdiocese of New York
- Features liturgical commission, resources, calendar, and liturgy of the hours.
- U.S. Catholic Bishops: Committee on the Liturgy
- Includes newsletter, Roman Missal, prayer, and more.
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