2000. Knowledge representation : logical, philosophical, and computational foundations, Brooks Cole Publishing Co., Pacific GroveKnowledge Representation: Logical, Philosophical, and Computational Foundations at jfsowa.com. Retrieved Nov 23, 2012.
2000. Knowledge representation : logical, philosophical, and computational foundations, Brooks Cole Publishing Co., Pacific GroveKnowledge Representation: Logical, Philosophical, and Computational Foundations at jfsowa.com. Retrieved Nov 23 2012.