In the original Cantus index, differentiae were assigned two-digit codes, where the first letter indicated the last pitch of the differentia and the number distinguished between differentiae of the same mode had the same last pitch. The same codes were used for the indices of B-TO olv 63, B-TO olv 64, and NL-DHk 70 E 4.
de Loos, Ike. Inventory of Den Haag, Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland, 70 E 4. Edited by Andrew Mitchell. 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 a microfilm facsimile of the manuscript.
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on April 10, 2018. Edited by Jennifer Bain, Sister Ilaria Culshaw, Andrea Klassen, and Brayden Olson and (Dalhousie University) on August 8, 2019 and Rebecca Shaw on August 11, 2019.