Cita APA (7a ed.)

Rogerson, P., & Gilbert, J. B. (1990). Speaking clearly: Pronunciation and listening comprehension for learners of English. Cambridge University.

Cita Chicago Style (17a ed.)

Rogerson, Pamela, y Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English. Cambridge: Cambridge University, 1990.

Cita MLA (9a ed.)

Rogerson, Pamela, y Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English. Cambridge University, 1990.