1. A.W. Burks, H.H. Goldstine, and J. von Neumann. Preliminary discussion of the logical design of an electronic computing instrument. In in Aspray and Burks [AB87], volume1, pages97-142. The Institute of Advanced Study,Princeton, Reportto theU.S. Army Ordinance Department.
2. E. Morrison and P. Morrison. Charles Babbage and His Calculating Engines. New York, 1961.