FitzGerald, Jerry, Alan Dennis, and Alexandra Durcikova. Business Data Communications and Networking. Twelfth edition. Hoboken, NJ: Wiley, 2015. http://catalogimages.wiley.com/images/db/jimages/9781118891681.jpg.
———. Business Data Communications and Networking. Twelfth edition. Hoboken, NJ: Wiley, 2015.
Perlman, Radia. ‘An Algorithm for Distributed Computation of a Spanningtree in an Extended LAN’. In Proceedings of the Ninth Symposium on Data Communications - SIGCOMM ’85, 44–53. ACM Press, 1985. https://doi.org/10.1145/319056.319004.
Shay, William A. Understanding Data Communications and Networks. 3rd ed. Australia: Thomson Brooks/Cole, 2004.