Ur, P. (1991). Discussions that work: Task-centered fluency practice. Press Syndicate of the University of Cambridge.
芝加哥风格引文Ur, Penny. Discussions That Work: Task-centered Fluency Practice. Cambridge: Press Syndicate of the University of Cambridge, 1991.
MLA引文Ur, Penny. Discussions That Work: Task-centered Fluency Practice. Press Syndicate of the University of Cambridge, 1991.
警告：这些引文格式不一定是100％准确.