Citazione Stile APA (7a Edizione)

Crews, F. C. (1994). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1994.

Citatione MLA (8a ed.)

Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1994.