1. DHHS (NIOSH) Publication No. 2000–158, NIOSH HID 10, Workers Exposed to Class B Biosolids During and After Field Application, August 2000.
2. Harrison, E.Z., McBride, M.B., Bouldin, D.R., Cornell Waste Management Institute Working Paper, The Case For Caution, August 1997, Revised February 1999.
3. New York Times Science, Forget Sludge Cocktails, Tuesday, 27 February, 2001.
4. US EPA, Part 503-Standards for the Use or Disposal of Sewage Sludge, 40 CFR, Federal Register 58:9248–9415, (1993).
5. US EPA 530-R-99–09, Biosolids Generation, Use, and Disposal in The United States, Sept. 1999.