Heinrich Oidtmann started his career as a medical doctor in Linnich, Germany and later established a stained glass workshop. Oidtmann drew inspiration in setting up the workshop from his use of glass slides. His workshop would later grew into the Dr. H. Oidtmann GmbH by the efforts of his descendants.
- "The Oldest Stained Glass Workshop in Germany - Chronicle of the Oidtmann Workshop". Dr. H. Oidtmann GmbH. Dr. H. Oidtmann GmbH. Archived from the original on 3 March 2016. Retrieved 23 February 2015.
- "History of Stained Glass". Stained Glass Association of America. Retrieved 23 February 2015.
- "Oidtmann (H.) Glass and Mosaic Studios Linnich, Germany". Michigan Stained Glass Census. Michigan State University Museum. Retrieved 23 February 2015.