Blij, Harm J.. de
Physical geography of the global environment
John Wiley & Sons, 1996
 Buku Referensi
Blij, Harm J.. de
Physical geography of the global environment
John Wiley & Sons, 1993
 Buku Teks SO
Strahler, Alan H.
Physical geography : science and systems of the human environment
John Wiley & Sons, 1997
 Buku Teks SO
Knapp, Brian
Challenge of the human environment
Longman House, 1992
 Buku Teks
Global change and challenge : geography for the 1990s
edited by Robert Bennet and Robert Estall
Routledge, 1991
 Buku Teks SO