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References
- ↑ Commission, United States Federal Communications (1978). Federal Communications Commission Reports. V. 1-45, 1934/35-1962/64; 2d Ser., V. 1- July 17/Dec. 27, 1965-. Federal Communications Commission. pp. 118, 308–310.
- ↑ Jacobs, Stuart (2013-12-16). Security Management of Next Generation Telecommunications Networks and Services. John Wiley & Sons. p. 31. ISBN 978-0-470-56513-1.
- ↑ Proceedings of the National Communications Forum. Professional Education International, Incorporated. September 1989. p. 727. ISBN 978-0-933217-05-8.