Clementson T. Theresa. (2009). Natural English. Reading Writing Skills. Pre-intermediate: Resource Book. New York, Oxford University Press, 2009.
芝加哥风格引文Clementson T. Theresa. Natural English. Reading Writing Skills. Pre-intermediate: Resource Book. New York, Oxford University Press, 2009, 2009.
MLA引文Clementson T. Theresa. Natural English. Reading Writing Skills. Pre-intermediate: Resource Book. New York, Oxford University Press, 2009, 2009.
警告：这些引文格式不一定是100％准确.