1. The Fourth Industrial Revolution is here—are you ready? https://www2.deloitte.com/content/dam/Deloitte/tr/Documents/manufacturing/Industry4-0_Are-you-ready_Report.pdf. Accessed 21 Nov 2019
2. The Industrial Revolution and Work in Nineteenth-Century Europe—1992, Page xiv by David Cannadine, Raphael Samuel, Charles Tilly, Theresa McBride, Christopher H. Johnson, James S. Roberts, Peter N. Stearns, William H. Sewell Jr, Joan Wallach Scott. | Online Research Library: Questia. www.questia.com
3. History of Electricity, ibid
4. History–Future of Industry
5. BMBF-Internetredaktion (21 January 2016). “Zukunftsprojekt Industrie 4.0-BMBF”. Bmbf.de. Accessed 30 Nov 2016