Departemen Geografi FMIPA-UI, 2002
Majalah, Jurnal, Buletin
R. Bintarto, author
LP3ES, 1991
Buku Teks
edited by Edward Whiting Fox
Oxford University Press, 1957
Buku Teks
Sellman, Roger Raymond, author
Edward Arnold, 1954
Buku Referensi
Shepperd, William R., author
Barnes and Noble, 1959
Buku Referensi