APA-referens (7:e uppl.)

Allen, J. (1995). Natural language understanding (2nd ed.). Benjamin/Cummings Pub. Co. ; Pearson Education.

Chicago-referens (17:e uppl.)

Allen, James. Natural Language Understanding. 2nd ed. Redwood City, Calif. : New Delhi: Benjamin/Cummings Pub. Co. ; Pearson Education, 1995.

MLA-referens (8:e uppl.)

Allen, James. Natural Language Understanding. 2nd ed. Benjamin/Cummings Pub. Co. ; Pearson Education, 1995.