Citazione Stile APA (7a Edizione)

Rogerson, P., & Gilbert, J. B. (1993). Speaking clearly: Pronunciation and listening comprehension for learners of English, student's book. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Rogerson, Pamela, e Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English, Student's Book. Cambridge, Eng: Cambridge University Press, 1993.

Citatione MLA (9a ed.)

Rogerson, Pamela, e Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English, Student's Book. Cambridge University Press, 1993.