Gilbert, J. B. (1993). Clear speech: Pronunciation and listening comprehension in North American english, student's book (2a. ed.). Cambridge University Press.
Citace podle Chicago (17th ed.)Gilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in North American English, Student's Book. 2a. ed. Nueva York: Cambridge University Press, 1993.
Citace podle MLA (9th ed.)Gilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in North American English, Student's Book. 2a. ed. Cambridge University Press, 1993.
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