Hayes, Denis, author
The Official earth day guide to planet repair
Island Press, 2000
 Buku Teks
Hayes, Denis, author
The official Earth Day guide to planet repair
Island Press, 2000
 Buku Teks
The traveller's guide to planet Earth : experience 50 extraordinary destinations from the BBC's spectacular documentary
BBC Earth (Firm)
Lonely Planet, 2010
 Buku Referensi
Botkin, Daniel B., author
Environmental science : earth as a living planet
John Wiley & Sons, 1995
 Buku Teks
Botkin, Daniel B., author
Environmental science : earth as a living planet
John Wiley & Sons, 2000
 Buku Teks
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