Cita APA (7a ed.)
Gilbert, J. B. Clear Speech Pronunciation and Listening Comprehension in American English: Teacher's Manual and Answer Key. (Primera edición.).
Cita Chicago Style (17a ed.)
Gilbert, Judy B. Clear Speech Pronunciation and Listening Comprehension in American English: Teacher's Manual and Answer Key. Primera edición.
Cita MLA (9a ed.)
Gilbert, Judy B. Clear Speech Pronunciation and Listening Comprehension in American English: Teacher's Manual and Answer Key. Primera edición.
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