Encyclopedia of human intelligence : volume 2
editor in chief. Robert J. Sternberg
Macmillan, 1994
 Buku Referensi
Encyclopedia of artificial intelligence : volume 1
John Wiley & Sons, 1987
 Buku Referensi
Encyclopedia of human biology; Volume 1
edited by Renato Dulbecco
Academic Press, 1991
 Buku Referensi
Encyclopedia of artificial intelligence : volume 2
John Wiley & Sons, 1987
 Buku Referensi
Encyclopedia of linguistics : volume 1
Philipp Strazny, editor
Fitzroy Dearborn, 2005
 Buku Referensi