Halavais, Alexander, author
Polity, 2009
Buku Teks
Martin, William J., author
Brookfield, Vt., USA : Gower,, 1995.
Buku Teks
Castells, Manuel, author
Blackwell, 1996
Buku Teks
Castells, Manuel, author
Blackwell, 1998
Buku Teks
Castells, Manuel, author
Blackwell, 1997
Buku Teks