1. http://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers
,
http://en.wikipedia.org/wiki/Arab_world
.
2. Alkhouli, M.: Alaswaat Alaghawaiyah. Daar Alfalah, Jordan (1990) (in Arabic)
3. Deller, J., Proakis, J., Hansen, J.H.: Discrete-Time Processing of Speech Signal. Macmillan, Basingstoke (1993)
4. Elshafei, M.: Toward an Arabic Text-to-Speech System. The Arabian Journal for Scince and Engineering 16(4B), 565–583 (1991)
5. Cole, R., Fanty, M., Muthusamy, Y., Gopalakrishnan, M.: Speaker-Independent Recognition of Spoken English Letters. In: International Joint Conference on Neural Networks (IJCNN), vol. 2, pp. 45–51 (June 1990)