Douglas, D. (2010). Understanding language testing. Hodder Education.
Lua i Stíl Chicago (17ú heag.)Douglas, Dan. Understanding Language Testing. London: Hodder Education, 2010.
Lua MLA (8ú heag.)Douglas, Dan. Understanding Language Testing. Hodder Education, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.