Raven, Peter H. and Committee on the Formation of the National Biological Survey, United States National Research Council (1993). A Biological Survey for the Nation. Washington, DC: National Research Council, National Academy of Sciences. ISBN978-0-585-11276-3.{{cite book}}: CS1 maint: multiple names: authors list (link)
Gallagher, Kevin T. (June 2011) "NBII Program Termination Letter from Kevin Gallagher" National Biological Information Infrastructure, USGS Core Science Systems, United States Geological Survey, last accessed: 16 January 2012, original URL: http://www.nbii.gov/termination/index.htmlArchived 2012-01-17 at the Wayback Machine
Gallagher, Kevin T. (June 2011) "NBII Program Termination Letter from Kevin Gallagher" National Biological Information Infrastructure, USGS Core Science Systems, United States Geological Survey, last accessed: 16 January 2012, original URL: http://www.nbii.gov/termination/index.htmlArchived 2012-01-17 at the Wayback Machine