1. International Organization for Standardization (ISO), Environmental management — Life cycle assessment — Principles and framework. ISO 14040, 1997.
2. International Organization for Standardization (ISO), Environmental management — Life cycle assessment — Goal and scope definition and inventory analysis. ISO 14041, 1998.
3. International Organization for Standardization (ISO), Environmental management — Life cycle assessment — Life cycle impact assessment. ISO 14042, 2000.
4. International Organization for Standardization (ISO), Environmental management — Life cycle assessment — Life cycle interpretation. ISO 14043, 2000.
5. Nordic Guidelines on Life-Cycle Assessment. Nord 1995:20;Lindfors,1995