edited by Andreas Liese, K. Seelbach, Christian Wandrey
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Buku Teks
Kissell, Thomas E.
Prentice Hall International, 1997
Buku Teks
McCormick, Ernest J. (Ernest James), author
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Buku Teks
Toynbee, Arnold J., author
The Beacon Press , 1961
Buku Teks
Forrester, Jay W. (Jay Wright), author
John Wiley & Sons, 1961
Buku Teks