Griffiths, Martin, author
Routledge, 1992
Buku Teks
Said, Abdul Aziz, author
Prentice-Hall, 1995
Buku Teks
Brown, Chris
Harvester Wheatsheaf, 1992
Buku Teks
edited by John Baylis and Steve Smith
Oxford University Press, 2006
Buku Teks
George, Jim, author
Lynne Reinner, 1994
Buku Teks