De Boer, B. (2001). The origins of vowel systems. Oxford ; New York: Oxford University Press.
Trích dẫn kiểu ChicagoDe Boer, Bart. The Origins of Vowel Systems. Oxford ; New York: Oxford University Press, 2001.
MLA CitationDe Boer, Bart. The Origins of Vowel Systems. Oxford ; New York: Oxford University Press, 2001.
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