Barber, M. (2004). Two cities: Medieval Europe, 1050-1320 (2nd ed.). Routledge.
Lua i Stíl Chicago (17ú heag.)Barber, Malcolm. Two Cities: Medieval Europe, 1050-1320. 2nd ed. London ; New York: Routledge, 2004.
Lua MLA (8ú heag.)Barber, Malcolm. Two Cities: Medieval Europe, 1050-1320. 2nd ed. Routledge, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.