"Das Tragödie von L19" (in German). Zeppelin and Garrison Museum, Tondern. March 2002. Archived from the original on 2 July 2002. Retrieved 1 July 2010.
zeppelin-museum.dk
"Das Tragödie von L19" (in German). Zeppelin and Garrison Museum, Tondern. March 2002. Archived from the original on 2 July 2002. Retrieved 1 July 2010.