Castells, Manuel, author
Routledge, 1994
Buku Teks
Ika Darnhofer, editor
[, Springer], 2012
eBooks
Nugent William R., author
Thomson Learning, 2001
Buku Teks
Lawal, Ibironke O., author
Chandos Publishing, 2009
Buku Teks
Niles, Spencer G., author
Pearson, 2013
Buku Teks