PARISE M., DEL PRETE S., GALEAZZI C., GERMANI C. & SAMMARCO M., 2013, The map of ancient underground aqueducts, Speleologia (Bologna) 68 (2013): 48–49.,
URL: http://www.cnr.it/prodotto/i/269800

Data from https://intranet.cnr.it/people/