Crews, F. C. (1994). Speaking effectively: Developing speaking skills for business English. Cambridge University Press.
芝加哥风格引文Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: Cambridge University Press, 1994.
MLA引文Crews, Frederick C. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge University Press, 1994.
警告：这些引文格式不一定是100％准确.