Cooke-Yarborough, E. H. (1998). "Some early transistor applications in the UK". Engineering Science & Education Journal. 7 (3): 100–106. doi:10.1049/esej:19980301 (inactive 7 December 2024).{{cite journal}}: CS1 maint: DOI inactive as of December 2024 (link)
Cooke-Yarborough, E. H.; Barnes, R. C. M.; Stephen, J. H.; Howells, G. A. (1956). "A transistor digital computer". Proceedings of the IEE - Part B: Radio and Electronic Engineering. 103 (3S): 364–370. doi:10.1049/pi-b-1.1956.0076.
Irvine, M. M. (2001). "Early digital computers at Bell Telephone Laboratories". IEEE Annals of the History of Computing. 23 (3): 22–42. doi:10.1109/85.948904.