Trewartha, Glenn T., author
McGraw-Hill, 1967
Buku Teks
Briggs, David J., author
Longman Scientific & Technical, 1994
Buku Teks
Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
Haggett, Peter, author
Prentice-Hall, 2001
Buku Teks
Boyce, Ronald Reed, author
John Wiley & Sons, 1982
Buku Teks