Doff, A., & Jones, C. (2000). Languaje in use. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Doff, Adrian, agus Christopher Jones. Languaje in Use. United Kingdon: Cambridge University Press, 2000.
Lua MLA (9ú heag.)Doff, Adrian, agus Christopher Jones. Languaje in Use. Cambridge University Press, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.