Jackson, Richard H.
World regional geography: issues for today
Wiley, 1986
 Buku Teks
Jackson, Richard H.
World regional geography : issues for today
John Wiley & Sons, 1982
 Buku Teks
Jackson, Richard H.
World regional geography : issues for today
Wiley Eastern Limited, 1986
 Buku Teks
Scott, Andrew M.
Political thought in America
Holt, Rinehart & Winston, 1959
 Buku Teks
Barton, Jonathan R.
A political geography of Latin America
Routledge, 1997
 Buku Teks