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*  [https://de.wikipedia.org/wiki/Geha-Werke] Wikipedia Germany company page

*  [https://de.wikipedia.org/wiki/Geha-Werke] Wikipedia Germany company page

* [https://geha.de/geha/Pulsar/en_EU.CMS.display.285./company] Brief history on the company website

* [https://geha.de/geha/Pulsar/en_EU.CMS.display.285./company] Brief history on the company website

* [http://www.ruettinger-web.de/geha-startseite.html] Website dedicated to Geha (in German)

* [http://www.ruettinger-web.de/geha-startseite.html] Website dedicated to the company (in German)

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{{BrandData|Founder=Heinrich Hartmann, Conrad Hartmann|Place=Hannover|Date=1918|ProdDate=1950|Country=DE}}

{{BrandData|Founder=Heinrich Hartmann, Conrad Hartmann|Place=Hannover|Date=1918|ProdDate=1950|Country=DE}}