1. Adelsbach, M. 2012. “Zauberbuch”: Wer kann es entziffern? http://web.archive.org/web/20121102123749/http://einestages.spiegel.de/static/image_without_story/24402/_zauberbuch_wer_kann_es_entziffern.html.
2. “ACTION LINE” CHALLENGE
3. Anonymous. 2013. Written Mnemonics—Deciphering a Controversial Ritual. http://nationalheritagemuseum.typepad.com/library_and_archives/ciphers/.
4. Anonymous. 2014. Lord Hailsham's Coded Diary. http://www.margaretthatcher.org/archive/hailsham.asp.
5. THE VOYNICH MANUSCRIPT - BY VOYNICH?