Frey, Katherine Stenger
Journey to the land of the earth goddess
Gramedia, 1986
 Buku Referensi
Wechsberg, Joseph
Journey through the land of eloquent silence / Joseph Wechsberg
Little, Brown and Company, 1964
 Buku Teks
Tan, Chung Lee
Journey through Sarawak : a pictorial guide to the land of the dayaks
Marshall Cavendish Cuisine, 2006
 Buku Referensi
Gregory, Kenneth J.
The earth's land surface landforms and processes in geomorphology
Sage , 2010
 Buku Teks
Marsh, William M.
Environmental geography : science, land use, and earth systems
John Wiley & Sons, 1996
 Buku Teks