1. The ATM Forum 1994
2. International Telecommunication Union-Telecommunication Standardization Sector (ITU - T) http://www.itu.int/ITU - T/
3. International Telecommunications Union 1992
4. Broadband Forum http://www.broadband - forum.org
5. Cisco Systems Internetworking Technology Handbook http://www.cisco.com/en/US/docs/internetworking/technology/handbook/Tag - Switching.html