1. The Federation of Finnish Technology Industries,
http://www.teknologiateollisuus.fi/file/7250/jpkv07af_Teollisuustuotannonkehitysvuosittain.pdf.html
2. The Federation of Finnish Technology Industries,
http://www.teknologiateollisuus.fi/file/2764/Metallien_hintoja.pdf.html
3. Robinson, M.A.: How design engineers spend their time: Job content and task satisfaction. Design Studies 33, 391–425 (2012)
4. SFS-EN ISO 10303-210:en: Industrial automation systems and integration. Product data representation and exchange. Part 210: Application protocol: Electronic assembly, interconnection, and packaging design (ISO 10303-210:2001). European Committee for Standardization (CEN), Brussels (2003)
5. SFS-EN ISO 11442:en: Technical product documentation- Document management (ISO 11442:2006). European Committee for Standardization (CEN), Brussels (2006)