Maddex, Robert L., author
Constitutions of the world
London: Routledge, 1995,
 Buku Referensi
The World in figures
editorial information compiled by the Economist
The Economist Newspaper Limited, 1984
 Buku Referensi
Mason, Adrienne, author
The world of the spider
Sierra Club Books, 1999
 Buku Referensi
Forrester, Jay W. (Jay Wright), author
World dynamics
Wright-Allen Press, 1973
 Buku Teks
Keegan, John, author
World Armies
Gale Research, 1983
 Buku Teks
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