Steinmeyer, Jim (2008). Charles Fort : the man who invented the supernatural. New York: J.P. Tarcher/Penguin. p. 198. ISBN978-1-58542-640-9. OCLC196302255.
Steinmeyer, Jim (2008). Charles Fort : the man who invented the supernatural. New York: J.P. Tarcher/Penguin. p. 204. ISBN978-1-58542-640-9. OCLC196302255.
Steinmeyer, Jim (2008). Charles Fort : the man who invented the supernatural. New York: J.P. Tarcher/Penguin. p. 222. ISBN978-1-58542-640-9. OCLC196302255.