Esling, J. H. (1978). Voice quality in Edinburgh: A sociolinguistic and phonetic study.
Lua i Stíl Chicago (17ú heag.)Esling, John Henry. Voice Quality in Edinburgh: A Sociolinguistic and Phonetic Study. 1978.
Lua MLA (8ú heag.)Esling, John Henry. Voice Quality in Edinburgh: A Sociolinguistic and Phonetic Study. 1978.
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