Spufford, P. (1967). Origins of the English Parliament (C-1.). Longmans.
Lua i Stíl Chicago (17ú heag.)Spufford, Peter. Origins of the English Parliament. C-1. London: Longmans, 1967.
Lua MLA (9ú heag.)Spufford, Peter. Origins of the English Parliament. C-1. Longmans, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.