Overseas Students Trust , 1987
Buku Teks
Toffler, Alvin, author
Pan Books , 1971
Buku Teks
Grunig, Rudolf, author
Pringer, 2005
Buku Teks
edited by Gareth Williams, Martin Kenyon and Lynn Williams
Overseas Student Trust, 1987
Buku Referensi
Berstein, Jake
Institute of Finance , 1989
Buku Teks