Cita APA (7a ed.)

Gilbert, J. B. (1999). Clear speech: Pronunciation and listening comprehension in north american english. Teacher's resource book (2.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Gilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in North American English. Teacher's Resource Book. 2. Estados Unidos: Cambridge University Press, 1999.

Cita MLA (8a ed.)

Gilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in North American English. Teacher's Resource Book. 2. Cambridge University Press, 1999.