The Shakespearean Ciphers Examined: An Analysis of Cryptographic Systems Used as Evidence That Some Author Other Than William Shakespeare Wrote the Plays Commonly Attributed to Him William F. Friedman; Elizabeth S. Friedman.
Cambridge University Press, 1957
FREE! The Greatest of Literary Problems: The Authorship of the Shakespeare Works: An Exposition of All the Points at Issue, from Their Inception to the Present Moment James Phinney Baxter.
Houghton Mifflin, 1917