In the original Cantus index for this manuscript, differentiae were assigned arbitrary numbers within each mode.
Glaeske, Keith, Charles Downey, and Lila Collamore. Inventory of Arras, Bibliothèque municipale, 893 (olim 465). 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-).
Images: Arras, Bibliothèque municipale, 0893 (0465), Bibliothèque virtuelle des manuscrits médiévaux (BVMM)
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on August 24, 2017. Edited by Jennifer Bain, Sister Ilaria Culshaw, Lucia Denk, Andrea Klassen, and Brayden Olson (Dalhousie University) on August 29, 2019.