1. Hubert Zimmermann, “OSI Reference Model- The ISO Model of Architecture for Open System Interconnection” IEEE transaction on communications, vol.28, issue 4, April 1980.
2. http://www.escotal.com/osilayer.html.
3.http://computer.howstuffworks.com/osi.htm.
4.Margaret Rouse, “OSI (Open Systems Interconnection)”, in http://searchnetworking.techtarget.com/definition/OSI.
5. Regan (http://www.antiessays.com/freeessays/
96912.html) in 2004.
6. J.R. Aschenbrenner. “Open Systems Interconnections”,
IBM SYSTEMS KIURNAL, VOL 25. NOS 3/4, 1986.
7. Hubert Zimmermann, “OSI Reference model-An ISO model Architecture for OSI”, in IEEE transaction on Communications, Vol. Com-28, No.4, April 1980.
8.http://media.techtarget.com/digitalguide/images/Misc/osi.gif.
9. Webopedia
(http://www.webopedia.com/quick_ref/OSI_Layers.asp ).
10.http://whatis.techtarget.com/reference/OSI-Reference-Model-illustrated.
11. Michael Scheidell, “Three Undocumented Layers of the OSI Model and Their Impact on Security”, SECNAP Network Security Corporation.