Wikipedia entry on Fourth Industrial Revolution, December 07, 2016, https://en.wikipedia.org/wiki/Fourth_Industrial_Revolution

Klaus Schwab, “The Fourth Industrial Revolution: what it means, how to respond”, World Economic Forum, January 14, 2016, https://www. weforum.org/agenda/2016/01/the-fourth-industrial-revolution-what-it– means-and-how-to-respond