Rogerson, P., & Gilbert, J. B. (1993). Speaking clearly: Pronunciation and listening comprehension for learners of English, student's book. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Rogerson, Pamela, agus Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English, Student's Book. Cambridge, Eng: Cambridge University Press, 1993.
Lua MLA (9ú heag.)Rogerson, Pamela, agus Judy B. Gilbert. Speaking Clearly: Pronunciation and Listening Comprehension for Learners of English, Student's Book. Cambridge University Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.