1. Borland: Turbo Prolog. Borland International, Inc., Scotts Valley, CA, 1986.
2. Knowledge Acquisition for Expert Systems: Experience in Leukaemia Diagnosis
3. : Gödel, Escher, Bahk. Vintage Books, New York, pp 131-134, 1979.
4. : Computer-Based Medical Consultations. MYCIN. Elsevier, New York, 1976.
5. : Computing machinery and intelligence. 1950.