Comfort, J. (1984). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1984.
Lua MLA (8ú heag.)Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1984.
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