Ballard, Robert D., author
Exploring our living planet
National Geographic Society, 1983
 Buku Referensi
Umar Abdul Aziz, author
Pemasangan otomasi active tilting system sepeda roda tiga menggunakan modul arduino = Installation of automated active tilting system on tricycle using arduino module
Fakultas Teknik Universitas Indonesia, 2019
 UI - Skripsi (Membership)
Interactive world issues : of place and planet
McGaw-Hill, 2004
 Multimedia
Interactive world issues : of place and planet
McGaw-Hill, 2004
 Multimedia
Muller, Robert A., author
Physical geography today : a portrait of a planet
Random House, 1978
 Buku Teks
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