1. Production, sales and calculated release of CFC 113, CFC 114 and CFC 115 for the years 1980–1988;CMA (Chemical Manufacturers Association),1990
2. Production, sales and calculated release of CFC 113, CFC 114 and CFC 115 for the years 1980–1989;CMA (Chemical Manufacturers Association),1991
3. The production and release to the atmosphere of CFCl3 and CF2Cl2 (chlorofluorocarbons CFC 11 and CFC 12);Gamlen;Atmospheric Environment,1986
4. Chlorofluorocarbons (CFCs) 113, 114 and 115. Annual production and sales for the years 1980–1988;Grant,1990
5. Chlorofluorocarbons (CFCs) 113, 114 and 115. Annual production and sales for the years 1980–1989;Grant,1991