by the Economist Intelligence Unit and the Cartographic Dept. of the Clarendon Press
Oxford University Press, 1956
Buku Referensi
edited by Regina Cowen Karp
Oxford University Press, 1993
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Geneve League of Natins 1945,
Buku Teks
East, Roger, author
Pinter Publishers, 1997
Buku Teks
Alenka Selih
Springer, 2012
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