World Facts : countries of the world
Gedes & Grosset, 2001
 Buku Referensi
Atlas of the world
Gedes & Grosset, 2003
 Buku Referensi
McEvery, Colin
Atlas of world population history
Facts On File, 1979
 Buku Referensi
Danan Arya Pradana
Hyperspectral unmixing menggunakan norm L2,1 dan total variation untuk mendeteksi material di permukaan bumi = Hyperspectral unmixing using L2 1 norm and total variation for material detection on earth's surface
Fakultas Teknik Universitas Indonesia, 2019
 UI - Skripsi Membership
Gregory, Kenneth J.
The earth's land surface landforms and processes in geomorphology
Sage , 2010
 Buku Teks SO