Links:

https://web.archive.org/web/20120709005409/http://www.dietz-computer-systeme.de

https://www.amazon.de/Aufbruchsjahre-Goldene-Zeitalter-deutschen-Computerindustrie/dp/3906501140/ref=sr_1_1?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=ISBN+978-3-906501-14-7&qid=1605636892&sr=8-1

http://www.innovatio.de/

http://computermuseum.informatik.uni-stuttgart.de/dev/mincal523/