APA-referens (7:e uppl.)
Comfort, J. a. (1994). Speaking effectively: Developing speaking skills for business english. CUP.
Chicago-referens (17:e uppl.)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: CUP, 1994.
MLA-referens (9:e uppl.)
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. CUP, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.