Liturgical book

A liturgical book, or service book, is a book published by the authority of a church body that contains the text and directions for the liturgy of its official religious services.

Manuscript of the Introit of the Mass (Florence, Italy).
Excerpt from the missal, a liturgical book, of the Sint-Pieters abbey (Ghent), manufactured in the 13th century. Manuscript preserved in the Ghent University Library.[1]