1. Safe Harbor Agreements: carving out a new role for NGOs;Bean;Conserv. Biol. Pract.,2001
2. Department of the Interior 2007 Memorandum from the Solicitor on “The Meaning of ‘In Danger of Extinction Throughout All or a Significant Portion of its Range.’’’ http://www.doi.gov/solicitor/M37013.pdf
3. Fish and Wildlife Service 1983 Endangered and Threatened Species Listing and Recovery Priority Guidelines Federal Register 48 43098
4. Fish and Wildlife Service 2008 Report to Congress on the Recovery of Threatened and Endangered Species: Fiscal Years 2005-2006 http://www.fws.gov/endangered/recovery/reports-to-congress/2005-6/2005-6%20report.pdf
5. Kareiva , P et al 1999 Using Science in Habitat Conservation Plans http://www.nceas.ucsb.edu/nceas-web/projects/2049/hcp-1991-01-14.pdf