Crews, F. C. (1994). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.
Chicago-referens (17:e uppl.)Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1994.
MLA-referens (8:e uppl.)Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.