James, Preston E.
One world divided : a geographer looks at the modern world
John Wiley & Sons, 1980
 Buku Teks SO
Israel, Saul
World geography today
Holt, Rinehart and Winston, 1976
 Buku Teks
Jackson, Richard H.
World regional geography: issues for today
Wiley, 1986
 Buku Teks
Jackson, Richard H.
World regional geography : issues for today
Wiley Eastern Limited, 1986
 Buku Teks
Jackson, Richard H.
World regional geography : issues for today
John Wiley & Sons, 1982
 Buku Teks SO