Saaty, Thomas L., author
Embracing the future : meeting the challenge of our changing world
Praeger, 1990
 Buku Teks
Christenson, Reo M.
Challenge and decision : political issues of our time / Reo M. Christenson
Harper & Row Publishers, 1982
 Buku Teks
Hryniewicz, Waclaw
The challenge of our hope : Christian faith in dialogue / Waclaw Hryniewicz
Council for Research in Values and Philosophy, 2007
 Buku Teks
The Challenge of climate change for developing country: Indonesia's case
 Artikel Jurnal
Shriver, Sargent, author
The challenge and the change=Point of the lance / Sargent Shriver
Pyramid Books, 1965
 Buku Teks
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