APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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