Columbia subject headings:
Catholic Church--Liturgy--Bibliography.
Christian art and symbolism--Europe--Medieval, 500-1500--Bibliography.
Church music--Catholic Church--Bibliography.
Church music--Orthodox Eastern Church--Bibliography.
Illumination of books and manuscripts, European--Bibliography.
Judaism--Liturgy--Bibliography.
Orthodox Eastern Church--Liturgy--Bibliography.
Harvard subject headings:
Liturgics--Bibliography.
Princeton subject headings: