McCulloch, John I. B.
Challenge to the Americans
New York The Foreign Policy Association 1940
 Buku Teks
Engler, Richard E., author
The challenge of diversity
Harper & Row, 1964
 Buku Teks
Kouzes, James M., author
The leadership challenge
Jossey-Bass, 2002
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The challenge of management
edited by Alan M. Glassman
A Wiley/Hamilton Publication, 1978
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Miner, John B., author
The challenge of managing
W.B. Saunders, 1975
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