Columbia University Press, 1949
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1993
Buku Teks
Stavrianos, Leften Stavros, author
Allyn and Bacon, 1967
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1996
Buku Referensi
Gabler, Robert E., author
Thomson , 2004
Buku Teks