Murphy, Walter F.
The John Hopkins University Press, 2007
Buku Teks
Millspaugh, Arthur Chester, 1883-1955
The Brookings Institution, 1942
Buku Teks
Millspaugh, Arthur Chester, |1883-1955
The Brookings Institution, 1942
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Roller, Edeltraud
Oxford University Press, 2008
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Christian Soe
McGraw-Hill, 2004
Buku Teks