George Ronald. ISBN 0-85398-443-3. "Udo Schaefer verstorben – bahaitum.de". www.bahaitum.de. Archived from the original on 2019-08-30. http://www.udoschaefer...
the 19th century, the history of the Baháʼí Faith in Germany (German: Bahaitum) begins in the early 20th century when two emigrants to the United States...