Cita APA (7th ed.)

Herwings, M. (1991). Pronunciation tasks: Course for pre-intermediate learners. Cambridge University Press.

Cita Chicago (17th ed.)

Herwings, Martin. Pronunciation Tasks: Course for Pre-intermediate Learners. Cambridge: Cambridge University Press, 1991.

Cita MLA (9th ed.)

Herwings, Martin. Pronunciation Tasks: Course for Pre-intermediate Learners. Cambridge University Press, 1991.