Jessica Pingkan, author
Universitas Indonesia, 2015
UI - Skripsi (Membership)
Gregory, Kenneth J., author
Sage , 2010
Buku Teks
Djamang Ludiro, author
Jurusan Geografi FMIPA Universitas Indonesia, 1993
Buku Teks
Easterbrook, Don J.
Macmillan Publishing Company, 1993
Buku Teks
Ahmad Andri Gribaldi, author
1995
UI - Skripsi (Membership)