Allen, J. (1995). Natural language understanding (2nd ed.). Benjamin/Cummings Pub. Co..
芝加哥风格引文Allen, James. Natural Language Understanding. 2nd ed. Redwood City, Calif.: Benjamin/Cummings Pub. Co., 1995.
MLA引文Allen, James. Natural Language Understanding. 2nd ed. Benjamin/Cummings Pub. Co., 1995.
警告：这些引文格式不一定是100％准确.