1. American National Standard for Telecommunications. Telecom glossary 2000. Available at: http://www.atis.org/tg2k/_electronic_publishing.html.
2. Jones B. Manuscripts, books, and maps: the printing press and a changing world. Available at: http://communication.ucsd.edu/bjones/Books/four.html. Accessed January 22, 2004.
3. The scientific journals;Ornstein,1938
4. McDonell KL. The changing nature of the scholarly journal. Available at: http://www.slais.ubc.ca/courses/libr500/fall1999/www_presentations/K_macdonell/origin.htm.
5. Price theory and applications;Landsburg,2002