Beck, Ulrich, author
Malden, MA :Polity Press, 2005
Buku Teks
edited by Laura J. Shepherd
Routledge, 2015
Buku Teks
Holsti, Kalevi J., author
Prentice-Hall, 1977
Buku Teks
Spero, Joan Edelman, author
Wadsworth, 2010
Buku Teks
Forsythe, David P., 1941-, author
Cambridge University Press, 2000
Buku Teks