De Blij, Harm J., author
John Wiley & Sons, 2010
Buku Teks
Jones, Stephen B.
Rand McNally & Company, 1962
Buku Teks
by William G. Moseley ... [and others]
Wiley Balckwell, 2014
Buku Teks
White, C. Langdon, author
Prentice-Hall, 1943
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 2005
Buku Teks