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Roach, Peter. (2017). English Phonetics and Phonology : A Practical Course (4th. Ed). united kingdom: Cambridge University Press.

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Roach, Peter. English Phonetics and Phonology : A Practical Course. 4th. Ed united kingdom: Cambridge University Press, 2017. Text.

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Roach, Peter. English Phonetics and Phonology : A Practical Course. 4th. Ed united kingdom: Cambridge University Press, 2017. Text.

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Roach, Peter. English Phonetics and Phonology : A Practical Course. 4th. Ed united kingdom: Cambridge University Press, 2017. Print.