Mache 1986, pp. 230–242 Mache, Wolfgang W. (October 1986), "Geheimschreiber", Cryptologia, 10 (4): 230–242, doi:10.1080/0161-118691861065 (Reprinted in: Cryptology: Yesterday, Today and Tomorrow, Artech House, Norwood, 1987)
Deavours & Kruh 1986, pp. 243–247 Deavours, Cipher A.; Kruh, Louis (October 1986), "Appendix Mechanics of the German Telecipher Machine", Cryptologia, 10 (4): 230–242, doi:10.1080/0161-118691861074 (reprinted in Cryptology: Yesterday, Today and Tomorrow, Artech House, Norwood, 1987)
Mache 1989, pp. 97–117 Mache, Wolfgang W. (April 1989), "The Siemens Cipher Teletype in the History of Telecommunications", Cryptologia, 13 (2): 97–117, doi:10.1080/0161-118991863817 (reprinted in Selections from Cryptologia: History, People, and Technology, Artech House, Norwood, 1998)
