APA استشهاد

Comfort Jeremy. (2002). Speaking effectively (developing speaking skills for business english). Cambridge University Press.

استشهاد بنمط شيكاغو

Comfort Jeremy. Speaking Effectively (developing Speaking Skills for Business English). Cambridge: Cambridge University Press, 2002.

MLA استشهاد

Comfort Jeremy. Speaking Effectively (developing Speaking Skills for Business English). Cambridge University Press, 2002.