Dannreuther, Roland., author
Polity, 2013 , 2013
Buku Teks
Adams, John, 1938-, author
St. Martin's Press, 1985
Buku Teks
Sharp, Walter R.
Rinehart, 1944
Buku Teks
Linklater, Andrew, author
Cambridge University Press,, 2006
Buku Teks
Holsti, Kalevi J., author
Prentice-Hall, 1977
Buku Teks