Boulding, Elise, author
Dialogue Path Press, 2010
Buku Teks
Diez-Hochleitner, Ricardo, author
I.B. Tauris, 2008
Buku Teks
Paris, Roland, author
Cambridge University Press, 2004
Buku Teks
edited by Charles Webel and Jorgen Johansen
Routledge, 2012
Buku Teks
Toynbee, Arnold J., author
Oxford University Press , 1976, 1989
Buku Teks