Marsh, William M., author
Cambridge University Press, 2013
Buku Teks
Strahler, Alan H., author
John Wiley & Sons, 1997
Buku Teks
Whittow, John B., author
Allen Lane, 1984
Buku Referensi
Strahler, Alan A., author
John Wiley & Sons, 1996
Buku Teks
Strahler, Arthur N., author
John Wiley & Sons, 1973
Buku Teks