Julius August Wagenmann (1878). "Gerhard, Johann Ernst der Ältere". Gerhard, Johann Ernst I und II. Confusingly both Johann Ernst Gerhard (1621-1668) and his son, Johann Ernst Gerhard (1662-1707) are referred to in sources as "Johann Ernst Gerhard the elder" ("Johann Ernst Gerhard der Ältere"). Even more confusingly, the Allgemeine Deutsche Biographie, cited here as a source, conflates father and son into a single article. Allgemeine Deutsche Biographie (Historischen Kommission bei der Bayerischen Akademie der Wissenschaften). p. 772. Retrieved 24 March 2017.