Have you used the database for general data discovery? Cite it this way:

Cantus Database. Directed by Debra Lacoste (2011-present), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996); developed for the web by Jan Koláček (2011-2023), McGill University Distributed Digital Music Archives & Libraries Lab - DDMAL (2023-present); and funded through the Digital Analysis of Chant Transmission project at Dalhousie University, Halifax, Nova Scotia, Canada (SSHRC 895-2023-1002), directed by Jennifer Bain, https://cantusdatabase.org. [Date accessed].

Have you used individual catalogues extensively? Cite them following this style:

Judith Dietz, Jennifer Bain, and Meredith Evans. Inventory of "Halifax (Canada), St. Mary’s University - Patrick Power Library, M2149.L4 1554 [Salzinnes Antiphonal]." Edited by Debra Lacoste. Additional fields added or edited by Alessandra Ignesti, Maria Murphy, Clare Neil, and Barbara Swanson. In: Cantus Database. Directed by Debra Lacoste (2011-present), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996); developed for the web by Jan Koláček (2011-2023), McGill University Distributed Digital Music Archives & Libraries Lab - DDMAL (2023-present); and funded through the Digital Analysis of Chant Transmission project at Dalhousie University, Halifax, Nova Scotia, Canada (SSHRC 895-2023-1002), directed by Jennifer Bain, https://cantusdatabase.org[ADD /source-number]. [Date accessed].

How to cite Cantus chant ID numbers:

"Cantus ID 001234"

For publications, presentations, etc., please use the following format to cite Cantus ID numbers:

• the prefix “Cantus ID”
• one space
• the number assigned to the chant in “Cantus Database” and “Cantus Index”

For example, “Cantus ID 001234", “Cantus ID 006745a”, “Cantus ID g02576”, “Cantus ID a00345”.