The original indexer, Charles Downey, assigned numbers arbitrarily to the manuscripts differentiae.
Downey, Charles. Inventory of Città del Vaticano (Roma), Biblioteca Apostolica Vaticana, Cappella Sistina 27. In: Cantus: A Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
Differentiae indexed in consultation with microfilm images of the manuscript from the Vatican Library (Biblioteca Apostolica Vaticana).
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on February 24, 2019. Edited by Jennifer Bain, Sister Ilaria Culshaw, Lucia Denk, and Brayden Olson (Dalhousie University) on September 13, 2019.