1. “Mineral Commodity Summaries, Aluminum” (Washington, D.C.: U.S. Geological Survey, 2006).
2. “Aluminum for Future Generations: Sustainability Update 2005” (Haymarket, London, UK: International Aluminum Institute, 2005).
3. “The Aluminum Industry’s Sustainable Development Report” (Haymarket, London, UK: International Aluminum Institute, 2002).
4. “Aluminum Statistical Review for 2005” (Arlington, VA: The Aluminum Association, Inc., 2006).
5. Subodh K. Das and Margaret Hughes, “Improving Aluminum Can Recycling Rates: A Six Sigma Study in Kentucky,” JOM, 58(8) (2006), pp. 27–31.