APA引文

Doff, A. (2011). English unlimited A1: Starter coursebook. Cambridge: Cambridge University Press.

Trích dẫn kiểu Chicago

Doff, Adrian. English Unlimited A1: Starter Coursebook. Cambridge: Cambridge University Press, 2011.

MLA引文

Doff, Adrian. English Unlimited A1: Starter Coursebook. Cambridge: Cambridge University Press, 2011.

警告：這些引文格式不一定是100％准確.