edited by W. Ladd Hollist
Westview Press, 1985
Buku Teks
Bhagwati, Jagdish, author
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Buku Teks
Balaam, David N., 1950-, author
Pearson Education, 2014
Buku Teks
Balaam, David N., 1950-, author
Pearson/Prentice Hall, 2005
Buku Teks
Vernon, Raymond, author
Prentice-Hall, 1996
Buku Teks