Bouvier, Leon F.
World population : challenges for the 21st century
Seven Lucks Press, 1999
Buku Teks
Entering the 21st century: world development report 1999/2000
Oxford , 2000
Buku Teks
Grenville, J.A.S.
A history of the world : from the 20th to the 21st century
Routledge, 2005
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Tanaka, Akihiko
The new Middle Ages: the world system in the 21st Century
International House of Japan, 2002
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Mayall, James B. L.
Towards the new horizon : world order in the 21st century
Standard Publishers, 2009
Buku Teks