Cita APA (7th ed.)
Comfort, J. a. (1994). Speaking effectively: Developing speaking skills for business english. CUP.
Cita Chicago (17th ed.)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: CUP, 1994.
Cita MLA (9th ed.)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. CUP, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.