Information from the following sources was used for this section.
Object record 0985.09.00068 and 0985.13.00338 – American Civil War Museum
Sold at auction: Extremely rare confederate cipher disc – Invaluable.com
Confederate Cipher Disc – Crypto Museum
Vigenère cipher disc – Cipher Machines
The Codebreakers: The Story of Secret Writing, 1967 (rev. ed., 1996) – Kahn, David