Charlotte Dorothea (Arndt) Rassow to Hartmuth Arndt, Platenberg, December 16, 1847, Box: 1, Folder: 23. Ernst Moritz Arndt collection, MS 378. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/538908 Accessed February 18, 2025.