Brzezinski, Zbigniev K.
The grand failure : the birth and death of communism in the twentieth century
Collier Books, 1990
 Buku Teks SO
Brzezinski, Zbigniev K.
The Grand failure : the birth and death of communism in the twentieth century
Chartes Scribner's, 1989
 Buku Teks SO
Russel, Fox Hon
Justice in the twenty-first century
Covendish Publishing Limited, 2000
 Buku Teks
Baker, Stanley B.
School counselling for the twenty-first century
Prentince-Hall, 1996
 Buku Teks
Twenty-first century: prospects and problems
edited by Kee Hyong Kim
Kyung Hee University Press, 1980
 Buku Teks SO