Electronic switching : digital central office systems of the world
edited by Amos E. Joel, Jr.
IEEE Press : Sole Worldwide distributor, J. Wiley, 1982
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Smith, Sydney F.
Telephony and telegraphy : and introduction to instruments and switching systems (electromechanical and reed-electronic)
Oxford University Press, 1978
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Hobbs, Marvin
Modern communications switching systems
Tab Books, 1981
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Ali, Syed Riffat
Digital switching systems: system reliability and analysis
McGraw-Hill, 1997
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Briley, Bruce E.
Introduction to telephone switching
Addison-Wesley, 1983
 Buku Teks SO