Doff, A. (1999). Language use: Beginner. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoDoff, Adrian. Language Use: Beginner. Cambridge: Cambridge University Press, 1999.
MLA引文Doff, Adrian. Language Use: Beginner. Cambridge: Cambridge University Press, 1999.
警告：這些引文格式不一定是100％准確.