Christie, Daniel J.
Prentice-Hall, 2001
Buku Teks
edited by Charles Webel and Jorgen Johansen
Routledge, 2012
Buku Teks
Blumberg, Herbert H.
Cambridge University Press , 2006
Buku Teks
Wallensteen, Peter
Sage, 2002
Buku Teks
editor-in-chief, Lester Kurtz
Academic Press, 1999
Buku Referensi