Source: Praha, Národní knihovna ČR, ms. I E 12Siglum: CZ-Pu I E 12Folios: 55r-56rFolio: 055rSequence: 1Full text (or incipit): Sonet vox ecclesieGenre: SqRubrics: Item de sancta ClaraFeast: ClaraeCantus ID: ah10200Form: M