Kennedy, Paul M
Preparing for the twenty-first century / Paul Kennedy.
Vintage Books, 1993
 Buku Teks
Cetron, Marvin J.
Encounters with the future : a forecast of life into the 21st century / Marvin Centron and Thomas O'Toole
McGraw-Hill, 1982
 Buku Teks
Vesterman, William
Readings for the 21st century / William Vesterman and Josh Ozersky
[publisher not identified], [date of publication not identified]
 Buku Teks
Cities in the 21st century / edited by Gary Gappert and Richard V. Knight
Sage Publications, 1982
 Buku Teks
Hammond, Allen L., author
Which world ? scenarios for the 21st Century : global destinies, regional choices
Earthscan Publications, 1998
 Buku Teks
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