"Fondazione Federico Zeri - Università di Bologna, ente catalogatore della fotografia \"Hobbs, Sherley , First Quarter 16 century. Umbrian School. The Madonna and Child with St. Nicholas of Bari and another Bishop Saint\""@it . "Federico Zeri Foundation, cataloguing institution of the photograph \"Hobbs, Sherley , First Quarter 16 century. Umbrian School. The Madonna and Child with St. Nicholas of Bari and another Bishop Saint\""@en . . . . .