Baptismal certificate of Johann Peter Ditzel's son dated March 25th 1774, in: Hessen-Nassau: Zentralarchiv der Evang. Kirche, Büdingen deanery, Eckartshausen parish, baptism register 1757-1799, marriage register 1757-1799, viewed online at www.archion.de [last access 6. 9. 2022], image 127.
Baptismal certificate of Johann Adam Birkenstock 1781, in: Hessen-Nassau: Central Archive of the Protestant Church, Büdingen Deanery, Eckartshausen Parish, Baptism Register 1757-1799, marriage register 1757-1799, viewed online at www.archion.de [last access 6. 9. 2022], picture 206.