Gilbert, J. B. (2001). Clear speech from the start: Basic pronunciation and listening comprehension in North American English : student's book. Cambridge University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gilbert, Judy B. Clear Speech from the Start: Basic Pronunciation and Listening Comprehension in North American English : Student's Book. Cambridge, UK ; New York: Cambridge University Press, 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gilbert, Judy B. Clear Speech from the Start: Basic Pronunciation and Listening Comprehension in North American English : Student's Book. Cambridge University Press, 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.