Comfort, J. (1984). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.
Цитирование в стиле Чикаго (17-е изд.)Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1984.
Цитирование MLA (8-е изд.)Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1984.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.