Snow, Edgar
The World Publishing, 1944
Buku Teks
Snow, Edgar
Random House, 1941
Buku Teks
Hubbard, G.E.
International Secretariat Institute of Pasific Relations, 1943
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Linebarger, Paul Myron Anthony, 1913-1966
York D van Nostrand, 1954
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Millard, Thomas F.
Fisher Unwin, 1908
Buku Teks