Hawgood, David, author
Multimedia Gramedia Grup, 1986
Buku Teks
Irawan, author
BPFE-Yogyakarta, 1996
Buku Teks
The Stationery Office, 1999
Buku Teks
Barry, David, author
Prentice-Hall, 1985
Buku Teks
Naisbitt, John, author
Tian Xia Wen Hua, 1990
Buku Teks