"From a reading book to a structured canonical collection" offers an in-depth analysis of the development of the Ivonian works, including Decretum, Panormia, and Tripartita. This non-fiction book illuminates the textual history of medieval canonical collections before the late 12th century and shows how the understanding of 'canonical collection' has changed over time. The author, Szabolcs A. Szuromi, examines the manuscripts and fragments from the 11th and 12th centuries that belong to the Ivonian collection, providing a precise paleographic, codicological, and textual critical analysis. These research findings contribute to a deeper understanding of the gradual textual development and the intentions behind Ivo's compilatory work. The book is a valuable resource for anyone interested in the history of canon law and ecclesiastical practice in the Middle Ages.