Feigenbaum, Edward A.
(1963), "The Simulation of Verbal Learning Behavior", in
Edward A. Feigenbaum & Jerome Feldman (eds.),
Computers and Thought (New York: McGraw-Hill).
(Lockwood & SEL Q335.5 .F4)
Slagle, James R.
(1971),
Artificial Intelligence: The Heuristic Programming Approach
(New York: McGraw-Hill), Ch. 12. (SEL Q335 .S57)