Routledge , 1996
Buku Teks
Barnett, Jonathan
Westview Press, 1995
Buku Teks
Institute Sultan Iskandar , 2000
Buku Teks
edited by Peter Roberts and Hugh Sykes
Sage, 2003
Buku Referensi
edited by Peter Roberts, Hugh Sykes
Sage Publications, 2003
Buku Referensi