Matthews, Roger, author
Routledge , 2008
Buku Teks
Sanders, Teela, author
Sage, 2018
Buku Teks
Cambridge University Press, 2004
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1967
Buku Teks
Grant, Wyn, author
Harvester Wheatsheaf , 1993
Buku Teks