1. SETAC (1993): Guidelines for Life Cycle Assessment: A code of Practice. Society of Environmental Toxicology and Chemistry, Pensacola, FL., Sesimbra, Portugal
2. ISO 14040 (1997): Environmental Management-Life Cycle Assessment—Principles and Framework. ISO/FDIS/ TC207SC514040/1997(E)
3. ISO 14041 (1998): Environmental Management—Life Cycle Assessment—Goal and Scope Definition and Inventory Analysis. ISO/TC207/SC5/DIS 14041
4. ISO 14042(1999):EnvironmentalManagement-LifeCycle Assessment—Life Cycle Impact Assessment. Committee Draft. ISO/TC207/SC 5N 97
5. ISO 14043 (1999): Environmental Management—Life Cycle Assessment—Life Cycle Interpretation. Draft International Standard. ISO/TC207/SC 5N 104