Strahler, Arthur N.
Introduction to physical geography
John Wiley & Sons, 1973
 Buku Teks
Strahler, Arthur N.
Introduction to physical geography
John Wiley & Sons, 1973
 Buku Teks
Newbigin, Marion I.
An introduction to physical geography /Marion I. Newbigin
Dent & sons, Ltd., 1925
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Petersen, James F.
Physical geography
Brooks/Cole Cengage Learning, 2012
 Buku Teks
Strahler, Arthur N.
Physical geography
John Wiley & Sons, 1975
 Buku Teks