| [1] The Morkrum Printing Telegraph | (pdf) | Charles Krum & Howard Krum, 1911 |
| [2] A Brief History of The Morkrum Company | (pdf) | Howard L. Krum,
1925 |
| [3] The Teletype Story | Teletype
Corporation, 1958 |
|
| [4] History of Teletypewriter Development | (pdf) | R.A. Nelson and
K.M. Lovitt, 1963 |
| [5] History of Telegraphy from the Teletype Museum | (pdf) | Ransom D.
Slayton, 1983 |
| [6]
The Early Years of Teletype Development A Patent History |
(pdf) | Ransom D.
Slayton; 1983? |
| [7] Telex and TWX History | (pdf) | Donald E.
Kimberlin, 1986 |
| [8] History of Mark and Space | (pdf) | Harvey, 1990 |
| [9] AT&T Exits Telegraph Business | (pdf) | AT&T Press
Release, 1991 |
| [10] Some Notes on Teletype Corporation | (pdf) | Jim Haynes, 2001 |
| [11] A Synopsis of Teletype Corporation History | (pdf) | Don Robert
House, 2001 |
| [12] Teletypewriter Communication Codes | (pdf) | Gil Smith, 2001 |