Gregory, A. (2010). Britain and Ireland. Wiley-Blackwell.
Lua i Stíl Chicago (17ú heag.)Gregory, A. Britain and Ireland. Wiley-Blackwell, 2010.
Lua MLA (9ú heag.)Gregory, A. Britain and Ireland. Wiley-Blackwell, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.