1. E. M. Forster “The Machine Stops ” in The Oxford and Cambridge Review (Archibald Constable 1909); http://archive.ncsa.illinois.edu/prajlich/forster.html.
2. A. Weinreich “The future of the smart home: Smart homes & IoT: A century in the making ” Forbes Magazine 18 December 2017; www.forbes.com/sites/andrewweinreich/2017/12/18/the-future-of-the-smart-home-smart-homes-iot-a-century-in-the-making/#75d89a9657ac.
3. R. Bradbury “There Will Come Soft Rains ” in The Martian Chronicles (Simon & Schuster reprint ed. 2012).
4. D. Spicer “The ECHO IV home computer: 50 years later ” Computer History Museum 31 May 2016; www.computerhistory.org/atchm/the-echo-iv-home-computer-50-years-later/.
5. P. K. Dick Ubik (Doubleday 1969).