1965-, Skinner, Patricia (1995). Family power in southern Italy: the duchy of Gaeta and its neighbours, 850—1139. Cambridge: Cambridge University Press. ISBN 052146479X. OCLC 30112695.
R., Mathews, Karen (2018). Conflict, commerce, and an aesthetic of appropriation in the Italian maritime cities, 1000—1150. Leiden. ISBN 9789004335653. OCLC 1007067413.
Medieval Italy: texts in translation. Jansen, Katherine Ludwig, 1957-, Drell, Joanna H., 1965-, Andrews, Frances. Philadelphia: University of Pennsylvania Press. 2009. ISBN 978-0812206067. OCLC 828621064.
Ecologies and economies in medieval and early modern Europe: studies in environmental history for Richard C. Hoffmann. Bruce, Scott G. (Scott Gordon), 1967-. Boston: Brill. 2010. ISBN 9789047444572. OCLC 671307987.
