@book{,
address  = {Ponte San Giovanni (Perugia)},
author = {},
keywords = {Orvieto; Mittelalter},
editor = {Della Fina, Giuseppe M.},
series = {},
title={Storia di Orvieto. 2: Medioevo},
uniqueid = {1469993},
url = {http://opac.regesta-imperii.de/id/1469993},
year = {2007}
}