Greenia, Mark (2003) ‘The History of Computing: An Encyclopaedia of People and Machines that made Computer History’, Lexikon Services. A useful and comprehensive chronology of computer history including recognition of Lyons and LEO plus pictures and descriptions of the LEO initiatives. Note: a photo of LEO II/1 is wrongly labelled LEO 1, and the link to the LEO Computers Society website does not work. https://www.amazon.com/History-Computing-Encyclopedia-Machines-Computer/dp/0944601782
