Sparks, N. (2011). The guardian. Sphere.
Lua i Stíl Chicago (17ú heag.)Sparks, Nicholas. The Guardian. London: Sphere, 2011.
Lua MLA (8ú heag.)Sparks, Nicholas. The Guardian. Sphere, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.