1. Plastics: Making the Most of Our Resources, Association of Plastics Manufacturers in Europe, Avenue E Van Nieuwenheuyse 4, Box 3, B-1160, Brussels (1993).
2. Source: Chemical Industries Association, UK.
3. Source: Statistics Handbook (1993 edn), British Plastics Federation, UK (ISSN 1351–5594).
4. E.J. Stillwell, R.C. Canty, P.W. Kopf and A.M. Montrone, Packaging for the Environment: A Partnership for Progress, American Management Association, New York (1991) (ISBN 0-8144-5074-1).
5. Characterization of Municipal Solid Waste in the United States 1960 to 2000, Franklin Associates Ltd. (for US Environmental Protection Agency) (30 March 1988).