Baker, Stanley B.
School counselling for the twenty-first century
Prentince-Hall, 1996
 Buku Teks
Etzioni, Amitai
An immodest agenda : rebuilding America before the twenty-first century
McGraw-Hill, 1983
 Buku Teks
Perl, anthony
New Departures: rethinking rail passenger policy in the twenty-first century
The University Press, 2002
 Buku Teks
The formation of scholars : rethinking doctoral education for the twenty-first century
George E. Walker ... [and others]
Jossey-Bass, 2008
 Buku Teks
Brzezinski, Zbigniev K.
Out of control : global turmoil on the eve of the Twenty-First century / Zbigniew Brzezinski
Macmillan Publishing Company, 1993
 Buku Teks