Lecouteux, Claude (2016). Tatzelwurm". Encyclopedia of Norse and Germanic Folklore, Mythology, and Magic. Simon and Schuster. p. 344. ISBN 162055481X. apud Doblhoff (1896)
Ley (1948), p. 131 ראו כאן mentions a report issued by the Austrian Ministry of Forestry and Environmental Protection which stated that Tatzelwurm sightings could be explained as stray otters.