Crews, F. C. (1994). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.
Цитирование в стиле Чикаго (17-е изд.)Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1994.
Цитирование MLA (8-е изд.)Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1994.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.