Downey, Charles T. 1997. An Utrecht Antiphoner. Utrecht, Bibliotheek der Rijksuniversiteit 406 (3.J.7). Printouts from an Index in Machine-readable form. A Cantus Index. Musicological studies. edited by Ruth Steiner,  Ottawa.

de Loos, Ike. 1997. Utrecht, Bibliotheek der Rijksuniversiteit, Ms 406 (3.J.7) : facsimile reproduction of the manuscript. with an introduction by Ike de Loos and index by Charles Downey; Veröffentlichungen mittelalterlicher Musikhandschriften/Publications of mediaeval manuscripts. edited by Ruth Steiner,  Ottawa: The Institute of Mediaeval Music.