Friedman, W. F., & Friedman, E. (1957). 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 (Repr.). Univ. Press.
Chicago-Zitierstil (17. Ausg.)Friedman, William F., und Elizabeth Friedman. 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. Repr. Cambridge: Univ. Press, 1957.
MLA-Zitierstil (9. Ausg.)Friedman, William F., und Elizabeth Friedman. 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. Repr. Univ. Press, 1957.