Cita APA (7th ed.)

Underhill, N. (1987). Testing spoken language: A handbook of oral testing techniques (1a. ed.). Cambridge University.

Cita Chicago (17th ed.)

Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. 1a. ed. Cambridge: Cambridge University, 1987.

Cita MLA (9th ed.)

Underhill, Nic. Testing Spoken Language: A Handbook of Oral Testing Techniques. 1a. ed. Cambridge University, 1987.