1.
FitzGerald J, Dennis A, Durcikova A. Business Data Communications and Networking. Twelfth edition. Wiley; 2015. http://catalogimages.wiley.com/images/db/jimages/9781118891681.jpg
2.
Shay WA. Understanding Data Communications and Networks. 3rd ed. Thomson Brooks/Cole; 2004.
3.
Perlman R. An algorithm for distributed computation of a spanningtree in an extended LAN. In: Proceedings of the Ninth Symposium on Data Communications  - SIGCOMM ’85. ACM Press; 1985:44-53. doi:10.1145/319056.319004
4.
FitzGerald J, Dennis A, Durcikova A. Business Data Communications and Networking. Twelfth edition. Wiley; 2015.