APA (7th ed.) Citation

Dunn, V., & Gruber, D. (1991). Listening intermediate. Oxford University Press.

Chicago Style (17th ed.) Citation

Dunn, Viviane, and Diann Gruber. Listening Intermediate. Oxford: Oxford University Press, 1991.

MLA (9th ed.) Citation

Dunn, Viviane, and Diann Gruber. Listening Intermediate. Oxford University Press, 1991.