edited by Gerard J. Mangone
Van Nostrand Reinhold, 1983
Buku Teks
Soward, F.H.
Oxford University Press, 1950
Buku Teks
engle, Eloise
The John Day Company, 1963
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Departhemen of Geography University of Waterloo, 2005
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Chao, Wu
Kluwer Law International, 1996
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