J. Fuegi and J. Francis, "Lovelace & Babbage and the creation of the 1843 'notes'". IEEE Annals of the History of Computing 25 No. 4 (October–December 2003): 16–26. Digital Object Identifier
doi.org
Fuegi J, Francis J (October–December 2003). "Lovelace & Babbage and the creation of the 1843 'notes'". Annals of the History of Computing. 25 (4): 16–26. doi:10.1109/MAHC.2003.1253887. See pages 19, 25
