Strahler, Arthur N., author
John Wiley & Sons, 1989
Buku Teks
Strahler, Arthur N., author
John Wiley & Sons, 2004
Buku Teks
Hidore, John J., author
Scott, Foresman, 1974
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1996
Buku Referensi
Petersen, James F., author
Brooks/Cole Cengage Learning, 2012
Buku Teks