The New Westminster Dictionary of Liturgy and Worship
Religious Studies and Philosophy (Non-Circulating) BT 4009 .D25 D5 2002
ISBN: 0664226558
Publication: 2002

Dictionnaire d'Archéologie Chrétienne et de Liturgie
Religious Studies and Philosophy (Non-Circulating) BX 57 .C3
Publication: 1913-1953
With the exception of Book 14 part 1 and Book 15, this set is available online from the Internet Archive and The National Library of France:

• Book 1, Part 1 (A - Amende)
• Book 1, Part 2 (Amende - Azymes). Access may be restricted outside the United States.
• Book 2, Part 1 (B). Access may be restricted outside the United States.
• Book 2, Part 2 (C - Cesene). Access may be restricted outside the United States.
• Book 3, Part 1 (Chainage - Chypre)
• Book 3, Part 2 (Ciacconio - Cyzique)
• Book 4, Part 1 (D - Domestici)
• Book 4, Part 2 (Domestici - Employe)
• Book 5, Part 1 (Encaustique - Feux)
• Book 5, Part 2 (Fiançailles - Fustel de Coulanges) 
• Book 6, part 1 (G - Gotha; 1924-1925)
• Book 6, part 2 (Gothicum - Hypsistariens; 1924-1925)
• Book 7, part 1 (I - Invitatoire; 1925-1927)
• Book 7, part 2 (Iona - Jubilus; 1926-1927)
• Book 8, part 1 (Judaïsme - Latin; 1927-1929)
• Book 8, part 2 (Latran - Lexique; 1928-1929)
• Book 9, part 1 (Lexique - Listes; 1929-1930)
• Book 9, part 2 (Lit - Lydie; 1930)
• Book 10, part 1 (Lyon - Manosque; 1931-1932)
• Book 10, part 2 (Mans - Maximim; 1931-1932)
• Book 11, part 1 (Maximum - Miniaturistes; 1932-1934)
• Book 11, part 2 (Minister Altaris - Monza; 1933-1934)
• Book 12, part 1 (Mora - Noé; 1934-1936)
• Book 12, part 2 (Noirmoutier - Orvieto; 1935-1936)
• Book 13, part 1 (Os - Papyrus; 1936-1937)
• Book 13, part 2 (Pâques - Peinture; 1937-1938)
• Book 14, part 1 (Peiresc - Porter; click here to request)
• Book 14, part 2 (Portiere - Rome; 1948)
• Book 15, part 1 (Ron - Sme. ; click here to request)
• Book 15, part 2 (Smy - Zra. ; click here to request)

Notitiae (online) - Periodical of the Congregation for Divine Worship and the Discipline of the Sacraments (CDWDS)

New Liturgical Movement / Novus Motus Liturgicus (online) - Contains recent news and articles, information about liturgical studies books, liturgical books, conference proceedings, organizations, lay societies, and many other resources. 

 Précis of official Catholic teaching - Religious Studies and Philosophy (Non-Circulating) ; BT 508 .P73