- How 2 Clean INSTA 800 education and certification
- R3nordic cleanroom association
- The Danish Counsil for better hygiene
- Danish Standard
- DS Certificering (now DNV GL)
- Linkedin profile Dennis Andersen
- Parental Drug Association (International Cleanroom)
- TAPfreelance
- Avista Time IT systems
- Video about DS2451-10
- HIS (Healthcare Infection Society)