Underhill, N. (1991). Testing spoken language: A handbook of oral testing techniques. Press syndicate of the University of Cambridge.
Lua i Stíl Chicago (17ú heag.)Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. Cambridge [Cambridgeshire]: Press syndicate of the University of Cambridge, 1991.
Lua MLA (9ú heag.)Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. Press syndicate of the University of Cambridge, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.