Citazione Stile APA (7a Edizione)

Comfort, J. (1984). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1984.

Citatione MLA (8a ed.)

Comfort, Jeremy. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1984.