1. Second Report of the Toxicity Sub-committee of the Main Technical Committee of The British Plastics Federation, with Methods of Analysis of Representative Extractants, The British Plastics Federation, 47–48 Piccadilly, London, W.1. 1962.
2. United States F Federal Register Title 21 Food and Drugs. Chapter 1. Food and Drug Administration Department of Health and Education and Welfare. Part 121. Food Additives: Subpart F, Food Additives resulting from contact with containers or equipment and food additives otherwise affecting food; Sections 121, 2501 (polypropylene) and 121, 2510 (polyethylene). Amendments published in the Federal Register. Pages 13.3, 13.4 and 13.8 March 13th, 1963. 28 F.R. 2445 and Pages 13.5, 13.6 and 13.7 - February 10th, 1962. 27 F.R. 1252. 121.51 Pages 4.1 to 4.6 November 28th, 1964. 29 F.R. 15916 (Subpart A. Food Additives), 121, 2526 Pages 28 to 28.1 February 25th 1965, 30 F.R. 2431 (Subpart F. Food Additives), 121, 2526 Page 28.2. February 18th, 1966. 31 F.R. 2897 (Subpart F. Food Additives). 121. 2526 Page 28.3. July 2nd, 1966. 31. F.R. 9106 (Subpart F. Food Additives) 121.2526 Page 28.3a February 8th, 1966. 31 F.R. 2476 (Subpart F. Food Additives) 121.2526 Page 28.4 January 28th, 1966. (Subpart F. Food Additives). 121.2526 Page 28.5 January 28th, 1966. 31.F.R.1149 (Subpart F. (Subpart F. Food Additives) 121.2526 Page 28.6 January 18th, 1966. 31.F.R. 560 (Subpart F. Food Additives) 121.2526 Page 28.7 February 25th, 1965. 30.F.R. 2431 (Subpart F. Food Additives)
3. Food and Drug Administration (1967), Code of Federal Regulations, Chapter 1, Part 121, Sections 121, 2514 and 121, 2526 pp 239 and 269. U.S. Government Printing Office, Washington D.C.
4. Masaero, M and Garlanda, T., La Chimica e l'Industria, No.47, 973 (1965).