Galtung, Johan, author
Pluto Press, 1995
Buku Teks
Diane Bretherton, Nikola Balvin, editor
[Springer, ], 2012
eBooks
Peter T. Coleman, Morton Deutsch, editors
[Springer, Springer], 2012
eBooks
Dulles, John Foster
Macmillan Company, 1950
Buku Teks
Bloomfield, Harold H., author
Ballantine Books , 1983
Buku Teks