Hidore, John J., author
Scott, Foresman, 1974
Buku Teks
Strahler, Alan H., author
John Wiley & Sons, 1997
Buku Teks
Marsh, William M., author
Cambridge University Press, 2013
Buku Teks
Strahler, Arthur N., author
John Wiley & Sons, 1975
Buku Teks
Duckson, Don W., author
McGraw-HIll, 1999
Buku Teks