Signorello, Lucrezia. “«Questa Sie La Resone De Li Libri Che Se Fano Del Choro Di Sancta Maria Del Popolo»: Prolegomena to the Study of the Choir Books of Santa Maria Del Popolo, Gleanings from the Documentary Sources and a Look at Two (unpublished) Illuminated Graduals by the Master of the Barbo Missal”. Bibliothecae.It, vol. 12, no. 2, Jan. 2023, pp. 257-05, doi:10.6092/issn.2283-9364/18713.