Barber, M. (2003). the two cities: Medieval europe 1050-1320 (Second edition.). Routledge.
Cita Chicago Style (17a ed.)Barber, Malcolm. The Two Cities: Medieval Europe 1050-1320. Second edition. London: Routledge, 2003.
Cita MLA (9a ed.)Barber, Malcolm. The Two Cities: Medieval Europe 1050-1320. Second edition. Routledge, 2003.
Precaución: Estas citas no son 100% exactas.