References
- Redford , K. 1992 . The empty forest . BioScience , 42 : 412 – 422 .
- Spence , M. D. 1999 . Dispossessing the Wilderness: Indian Removal and the Making of National Parks , Oxford : Oxford University Press .
- UNEP . 2007 . Global Environment Outlook—GEO 4 , Nairobi : United Nations Environment Programme .