1. Institute of Medicine (US) Committee on Quality of Health Care in America. Crossing the Quality Chasm: A New Health System for the 21st Century. Washington DC: National Academies Press; 2001.https://www.ncbi.nlm.nih.gov/books/NBK222274/. Accessed May 14 2020.
2. Bronze Age. History.com.https://www.history.com/topics/pre-history/bronze-age. Published January 2 2018. Updated September 30 2019. Accessed March 11 2020.
3. The history and evolution of surgical instruments. I. Introduction;Kirkup JR;Ann R Coll Surg Engl,1981
4. The discovery of stainless steel. British Stainless Steel Association.https://www.bssa.org.uk/about_stainless_steel.php?id=31. Accessed February 27 2020.