Feigenbaum, Edward A.
The fifth generation artificial intelligence and Japan's computer challenge to the world
Michael Joseph, 1984
 Buku Teks
Bessant, John
Managing advanced manufacturing technology: the challenge of the fifth wave
Blackwell, 1991
 Buku Teks SO
Watson, William
Sculpture of Japan from the fifth to the fifteenth century
London the Studio, 1959
 Buku Referensi
Handelman, Howard
The challenge of third world development
Pearson/Prentice Hall, 2006
 Buku Teks
The world economy: a global challenge
United Nations Departemen of Public Information, 1990
 Buku Teks SO