Clark, Gordon, author
Sage, 2003
Buku Teks
Getis, Arthur, author
McGraw-Hill, 2000
Buku Teks
Departemen Geografi FMIPA-UI, 2002
Majalah, Jurnal, Buletin
Latz, Gil, author
John Wiley & Sons, 1996
Buku Referensi
edited by Frank E. Bair
Gale Research Inc., 1991
Buku Referensi