Underhill, N. (1991). Testing spoken language: A handbook of oral testing techniques. Press syndicate of the University of Cambridge.
Chicago-referens (17:e uppl.)Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. Cambridge [Cambridgeshire]: Press syndicate of the University of Cambridge, 1991.
MLA-referens (9:e uppl.)Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. Press syndicate of the University of Cambridge, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.