Clark, Romy
Routledge, 1997
Buku Teks
Unger, Roberto Mangabeira
The Free Press, 1975
Buku Teks
Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Holsti, Kalevi J.
Prentice-Hall, 1977
Buku Teks