Lands and peoples : the world in color, volume 6 Canada, The United States
Grolier Incorporated, 1964
 Buku Referensi
James, Preston E., author
One world divided : a geographer looks at the modern world
John Wiley & Sons, 1980
 Buku Teks SO
Israel, Saul, author
World geography today
Holt, Rinehart and Winston, 1976
 Buku Teks
Kolevzon, Edward R., author
Our world and its people
Allyn and Bacon, 1959
 Buku Teks
Essentials of world regional geography
by Christopher L. Salter ... [et al.]
Saunders College Publishing, 2000
 Buku Teks
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