"DigiComp II". Cel 60 Celebration. Retrieved 2018-02-12.
patents.google.com
Godfrey, John Thomas (1968-07-02) [1965-04-30]. "Binary Digital Computer"(PDF). US Patent No. 3390471. Archived(PDF) from the original on 2020-07-27. Retrieved 2020-07-27. [1]
Godfrey, John Thomas (1968-07-02) [1965-04-30]. "Binary Digital Computer"(PDF). US Patent No. 3390471. Archived(PDF) from the original on 2020-07-27. Retrieved 2020-07-27. [1]
web.archive.org
Godfrey, John Thomas (1968-07-02) [1965-04-30]. "Binary Digital Computer"(PDF). US Patent No. 3390471. Archived(PDF) from the original on 2020-07-27. Retrieved 2020-07-27. [1]