Amadori, Maria Letizia, Elena Gramegna, Giuliana Raffaelli, Francesca Schillaci, Filippo Mangani, and Isodoro Bachiocca. 2003. “The Facade of the Church of Saint Spirit in Urbino: From Scientific Investigations to Restoration”. Conservation Science in Cultural Heritage 3 (1):115-32. https://doi.org/10.6092/issn.1973-9494/557.