References
- Ancestry.com. 2013. U.S., Military Registers, 1862–1970 [database]. Provo, UT: Ancestry.com Operations, Inc. Original data: United States Military Registers, 1902–1985, Salem: Oregon State Library.
- Army Security Agency. 1948. The History of Army Strip Cipher Devices. Republished as Special Research History 366. Records of the National Security Agency, RG 457, Entry 9002, College Park, MD: National Archives at College Park.
- Friedman, W. F. 1918. Several Machine Ciphers and Methods for Their Solution. Riverbank Laboratories Publication Number 20.
- Gaddy, D. 1995. “The Cylinder-Cipher,” Cryptologia, 19(4):385–391.
- General Correspondence of the Chief Signal Officer, Records of the Office of the Chief Signal Officer, Record Group 111, Entry 44, Boxes 387, 400. Washington, DC: National Archives.
- Historical Cryptologic Collection, Records of the National Security Agency, Record Group 457, Entry 9032, Box 793. College Park, MD: National Archives at College Park.
- Hitt Papers, David Kahn Collection, National Cryptologic Museum Library.
- Kahn, D. 1967. The Codebreakers, New York: Scribner.
- Kahn, D. 2004. “Charles J. Mendelsohn and Why I Envy Him,” Cryptologia, 28(1):1–17. http://david-kahn.com/articles-charles-mendelsohn-envy.htm (accessed 1 September 2014).
- Kruh, L. 1980. “The Evolution of Communciations Security Devices,” The Army Communicator, Winter.
- Kruh, L. 1981. “The Genesis of the Jefferson Bazeries Cipher Device,” Cryptologia, 5(4): 193–208.