Ignizio, J. P. (1991). Introduction to expert systems: The development and implementation of rule-based expert systems. McGraw-Hill.

Ignizio, James P. Introduction to Expert Systems: The Development and Implementation of Rule-based Expert Systems. New York: McGraw-Hill, 1991.

Ignizio, James P. Introduction to Expert Systems: The Development and Implementation of Rule-based Expert Systems. McGraw-Hill, 1991.