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National Research Council (U.S.). Committee on Review of Switching, Synchronization and Network Control in National Security Telecommunications, National Research Council (U.S.). Board on Telecommunications and Computer Applications, National Research Council (U.S.). Commission on Engineering and Technical Systems, National Communications System (U.S.), a John C. McDonald. Growing Vulnerability of the Public Switched Networks: Implications for National Security Emergency Preparedness : A Report. Washington, D.C.: National Academy Press, 1989.

National Research Council (U.S.). Committee on Review of Switching, Synchronization and Network Control in National Security Telecommunications, et al. Growing Vulnerability of the Public Switched Networks: Implications for National Security Emergency Preparedness : A Report. National Academy Press, 1989.