1. American Psychological Association. APA-Style Helper 2.0 (November 2000),
http://www.apa.org/apa-style/
2. Bray, T., Paoli, J., Sperberg-McQueen, C.M. (eds.): Extensible Markup Language (XML) 1.0. W3C (February 1998)
3. Lecture Notes in Computer Science;R. Brugger,1998
4. Microsoft Corporation. Microsoft Office 2000. Microsoft Press, Redmond (1999)
5. Lecture Notes in Computer Science;F. Gatzemeier,2000