Berman, Donald H. and Hafner, Carole D. 1986. “Obstacles to the Development of Logic-Based Models of Legal Reasoning.” in Computer Power and Legal Language, pp. 185–214. New York: Quorum Books.
Noy, Natalya Fridman and Hafner, Carole D. 1997. “The State of the Art in Ontology Design: A Survey and Comparative Review.”The AI Magazine 18(3): 53–74.