| aa.vv. | Enciclopedia multimediale Rizzoli Larousse 2001 | Rizzoli, 2001 |
| Heinz Joss | Elemente der Mathematik 53 (1988) pagg. 73-78, Messrechen: 350 Jahre Rechenschieber | Birkhäuser Verlag, 1988 |
| Florian Cajori | History of the logarithmic slide rule | 1909 |
| R. Dudin | La règle à calcul | Dunod, Parigi, 1959 |
| http://www-gap.dcs.st-and.ac.uk/~history | The MacTutor History of Mathematics archive |
| http://www.ee.ryerson.ca:8080/~elf/abacus/ | The Abacus: Index |
| http://www.hpmuseum.org | The Museum of HP Calculators |
| http://www.joernluetjens.de/index.html | Abakus, Rechenschieber und Zahlenschieber im Online-Museum |
| http://www.tecnoteca.it/contenuti/museo | Museo dell' informatica dell' università di Udine. |
| http://www.old-computers.com/museum/ | OLD-COMPUTERS.COM : The Museum |
| http://www.addiator.de/ | Addiator, con un bello strumento interattivo |
| http://www.ulisse.bs.it/museo/index.htm | Museo didattico del computer |