1. European Commission (2009) European Platform on Life Cycle Assessment. Retrieved January 12, 2009 from the World Wide Web: http://lca.jrc.ec.europa.eu/lcainfohub/dataset2.vm?id=23
2. International Organization for Standardization (1994) ISO 10303-1, Industrial automation systems and integration -Product data representation and exchange - Part 1: Overview and fundamental principles.
3. International Organization for Standardization (1998) ISO 10303-49, Industrial automation systems and integration - Product data representation and exchange - Part 49: Integrated generic resources - Process structure and properties.
4. International Organization for Standardization (1998) ISO 13584-42, Industrial automation systems and integration - Parts library - Part 42: Description methodology - Methodology for structuring parts families.
5. International Organization for Standardization (2001) ISO 13584-1, Industrial automation systems and integration - Parts library - Part 1: Overview and fundamental principles.