Walker, Terry, author
The S. Klien News Letter, 1986
Buku Teks
Negoita, Constantin Virgil, author
The Benjamin Cumming Pub., 1985
Buku Teks
Alty, J.L., author
NCC Publications, 1984
Buku Teks
edited by, Frederick Hayes-Roth, Donald A. Waterman and Douglas Lenat
Addison-Wesley, 1983
Buku Teks
edited by Larry Kerschberg
The Benjamin Cumming , 1986
Buku Teks