Raillon, Francois
Indonesia 2000 : the industrial and technological challenge
UNPF-ETP & Cipta Kreatif, 1990
 Buku Teks
Ozawa, Terutomo
Japan's technological challenge to the west, 1950-1974: motivation and accomplishment / Terutomo Ozawa
The Massachusetts Institute Press, 1974
 Buku Teks
Indonesia : the challenge of change
edited by Richard W. Baker [and others]
Institute of Southeast Asian Studies, 1999
 Buku Teks
Bro, Margueritte Harmon
Indonesia land of challenge
New York Harper & Brothers 1954
 Buku Teks
Mahathir bin Mohamad, 1925-
The challenge
Pelanduk Publications, 1986
 Buku Teks