Quelch, John A., author
The Marketing challenge of Europe 1992
Addison-Wesley, 1991
 Buku Teks
Central and Eastern Europe: the challenge of transition
edited by Regina Cowen Karp
Oxford University Press, 1993
 Buku Teks
Black C.E.
Challenge in Eastern Europe; 12 essays; foreword / by Joseph C. Grew
Rutgers Univ. Press, 1954, 1954
 Buku Teks
Mahathir bin Mohamad, 1925-, author
The challenge
Pelanduk Publications, 1986
 Buku Teks
Kouzes, James M., author
The leadership challenge
Jossey-Bass, 2002
 Buku Teks
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