Citazione Stile APA (7a Edizione)
Comfort, J. a. (1994). Speaking effectively: Developing speaking skills for business english. CUP.
Citazione stile Chigago Style (17a edizione)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: CUP, 1994.
Citatione MLA (9a ed.)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. CUP, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.