Reckoners Vol. 1 : The Prehistory of the Digital Computer, from Relays to the Stored Program Concept, 1935-1945 No. 1 by Paul E. Ceruzzi (1983, Hardcover)
^Paul E. CeruzziReckoners Vol. 1 : The Prehistory of the Digital Computer, from Relays to the Stored Program Concept, 1935-1945 No. 1 by Paul E. Ceruzzi (1983, Hardcover)ISBN 9780313233821 (revised Oct 2021)