1. http://www.nsf.gov/sbe/secure/advcom1108/Presentations/04.Seidel_SBE_Advisory.pdf.
2. Blue Ribbon Task Force on Sustainable Digital Preservation and Access. Sustaining the Digital Investment: Issues and Challenges of Economically Sustainable Digital Preservation; 2008. http://brtf.sdsc.edu/biblio/BRTF_Interim_Report.pdf.
3. Interagency Working Group on Digital Data. Harnessing the Power of Digital Data for Science and Society: Report of the Interagency Working Group on Digital Data to the Committee on Science of the National Science & Technology Council; 2009.http://www.nitrd.gov/About/Harnessing_Power_Web.pdf.