Robuta

https://wbc.poznan.pl/dlibra/publication/614098/edition/526678 Summa casuum conscientiae; Sixtus IV papa: Bulla (Etsi dominici gregis...) - Wielkopolska Digital... sixtus iv https://scholars.uky.edu/en/publications/the-body-of-the-city-medicine-and-urban-renewal-in-sixtus-ivs-rom/ The Body of the City: Medicine and Urban Renewal in Sixtus IV's Rome - University of Kentucky