Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The liturgical books of the Roman Rite are officially issued books that contain the words of the prayers to be recited and indicate the actions to be performed in the celebration of the Catholic liturgy as done in Rome. To the titles of some of these books the adjective Roman" is attached, so as to distinguish them from the liturgical books intended for use in other liturgical rites. An example is the "Roman Missal". These liturgical books have been classified as seven: the Missal, the Pontifical, the Liturgy of the Hours (in earlier editions called the Breviary), the Ritual, the Martyrology, the Gradual, and the Antiphonary. Another sevenfold list indicates, instead of the last two, the CÃ¦remoniale Episcoporum, and the Memoriale Rituum. In reality, the number is not fixed. Some names, such as the Ritual and the Pontifical, refer not to a single volume but to a collection of books that fit within the same category."