1. Lang, H.,, G.: A phone of our own: the deaf insurrection against Ma Bell. Gallaudet University Press (2000)
2. Vickrey Van Cleve, J.: Deaf history unveiled: interpretations from the new scholarship. Gallaudet University Press (1999)
3. ITU-T recommendation T.140: Protocol for multimedia application text conversation, ITU-T (1998)
4. Proposal R1 for Implementation of Real-Time Text Across Platforms,
http://trace.wisc.edu/docs/2008-RTT-Proposal/
(cited December 01, 2009)
5. http://www.itu.int/en/ITU-T/gsi/ngn/Pages/default.aspx