Janda, Kenneth, author
The challenge of democracy : government in America 1999-2000 update
Houghton Mifflin, 2000
 Buku Teks
Bowles, Chester, author
Africa's challenge to America / Chester Bowles
University Of California Press, 1956
 Buku Teks
LeBoeuf, Michael, author
The productivity challenge, how to make it work for america and you
McGraw-Hill, 1982
 Buku Teks
LeBoeuf, Michael, author
The productivity challenge how to make it work for America and you
McGraw-Hill, 1982
 Buku Teks
Fagen, Richard
Forging peace : the challenge of Central America / by Richard R Fagen
Blackwell, 1987
 Buku Teks
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