Gilbert, J. B. (1993). Clear speech: Student book (2ª ed.). Cambridge University Press.
Chicago Style (17th ed.) CitationGilbert, Judy B. Clear Speech: Student Book. 2ª ed. United Kingdom: Cambridge University Press, 1993.
MLA citiranjeGilbert, Judy B. Clear Speech: Student Book. 2ª ed. Cambridge University Press, 1993.
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