Cita APA (7th ed.)

Dunn, V., & Gruber, D. (1987). Listening intermediate. Oxford University Press.

Cita Chicago (17th ed.)

Dunn, Viviane, i Diann Gruber. Listening Intermediate. Oxford: Oxford University Press, 1987.

Cita MLA (9th ed.)

Dunn, Viviane, i Diann Gruber. Listening Intermediate. Oxford University Press, 1987.