Countries of the world and their leaders yearbook 1991
edited by Frank E. Bair
Gale Research Inc., 1991
 Buku Referensi
James, Preston E., author
One world divided : a geographer looks at the modern world
John Wiley & Sons, 1980
 Buku Teks
Kolevzon, Edward R., author
Our world and its people
Allyn and Bacon, 1959
 Buku Teks
Israel, Saul, author
World geography today
Holt, Rinehart and Winston, 1976
 Buku Teks
James, Preston E., author
The wide world: a geography
Macmillan, 1972
 Buku Teks
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