Frey, Katherine Stenger
Journey to the land of the earth goddess
Gramedia, 1986
Buku Referensi
Wechsberg, Joseph
Journey through the land of eloquent silence
Little, Brown, 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