Numelin, Ragnar
The beginnings of diplomacy : a sociological study of intertribal and international relations / Ragnar Numelin
Oxford University Press, 1950
 Buku Teks
Longfellow, Henry Wodsworth
Presenting the song of Hiawatha / Henry Wadsworth Longfellow
J.G. Ferguson Publishing Company, 1968
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Longfellow, Henry W.
The song of hiawatha : an epic poem / Henry W. Longfellow
Progress Publishers, 1967
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Carr, Edward Hallet
International relations between the to world wars 1919-1939
Harver Torchbooks, 1947
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Trade &​ economic relations
MN West Academic Publishing, 2015
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