LEO: The Incredible Story of the World's First Business Computer. - David T. Caminer; John Aris; Peter Hermon; Frank Land (J. Database Manag., 1999)

Inventing Systems Engineering. - John Aris (IEEE Ann. Hist. Comput., 2000)

Preface. - John Aris (J. Strateg. Inf. Syst., 2003)

A computer called LEO, Lyons teashops and the world's first office computer: Georgina Ferry, Fourth Estate, London, 2003, 221 pages, price £15.99, ISBN 1-84115-185-8. - John Aris (Int. J. Inf. Manag., 2004)