World geography
edited by Otis W. Freeman and John W. Morris
McGraw-Hill, 1958
 Buku Teks
The World bank
World Bank
World Bank, 1981
 Buku Teks
The Europa world year book 1992-1993
Europe Publications, 1992
 Buku Referensi
Hammond, author
Headline world atlas
Hammod Incorproted, 1986
 Buku Referensi
Pictorial history of the world
edited by Year
Oxford Paper, 1956
 Buku Teks
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