Wang, James C.F.
Prentice-Hall, 1994
Buku Teks
Solomos, John
Routledge, 1995
Buku Teks
Gilpin, Robert
Cambridge University Press, 1981
Buku Teks
Aitkin, Donald Alexander
Australian National University Press, 1982
Buku Teks
Deakin, Nicholas
Harvester Wheatsheaf, 1994
Buku Teks