Cyrille Vogel's Medieval Liturgy: An Introduction to the Sources is a comprehensive introductory guide designed to help researchers and students understand the primary sources for medieval Latin liturgy (c. 600–1500). It serves as an essential introduction to the 'raw materials', or original documents (primary sources) of church worship in the Western Middle Ages. Rather than simply discussing the history or theology of liturgy in the abstract, the book focuses primarily on the types of manuscripts and worship books in use at the time, and how to interpret and use them as historical sources. Key topics covered include: early sacramentaries from the Romano-Frankish and Romano-Germanic periods, liturgical books from non-Western Roman traditions, such as the Gaulish, Celtic, Mozarabic, and Ambrosian liturgies, 'Ordines' (order books), pontificals (ceremonial books reserved for bishops), and the liturgical calendar. Invaluable for anyone wishing to undertake in-depth research into how worship was performed and understood in the medieval period, providing a solid bibliographical and methodological foundation for studying the original Latin texts.