North Holland, 1989
Buku Teks
Walker, Terry
The S. Klien News Letter, 1986
Buku Teks
Alty, J.L.
NCC Publications, 1984
Buku Teks
edited by, Frederick Hayes-Roth, Donald A. Waterman and Douglas Lenat
Addison-Wesley, 1983
Buku Teks
Shapiro, Alen D.
Addison-Wesley, 1987
Buku Teks