APA (7th ed.) Citation

Allen, J. (1987). Natural language understanding. Benjamin/Cummings Pub.

Chicago Style (17th ed.) Citation

Allen, James. Natural Language Understanding. Menlo Park, Calif: Benjamin/Cummings Pub, 1987.

MLA (9th ed.) Citation

Allen, James. Natural Language Understanding. Benjamin/Cummings Pub, 1987.