Haggett, Peter
Prentice-Hall, 2001
Buku Teks
James, Preston E.
John Wiley & Sons, 1980
Buku Teks SO
Strahler, Arthur N.
John Wiley & Sons, 1983
Buku Teks SO
Strahler, Arthur N.
John Wiley & Sons, 1983
Buku Teks SO
edited by Toshio Noh and Douglas H. Gordon
Teikoku-Shoin, 1974
Buku Teks SO