4. Internet networks

Frey, Donnalyn and Rick Adams. (1991) !%@:: A Directory of Electronic Mail Addressing and Networks, (second edition) 436 p. O'Reilly & Assoc. Inc. Sebastopol, CA.

LaQuey, Tracy L. (1990) User's Directory of Computer Networks, 653 p. Digital Press, Bedford, MA.

Quarterman, John S. (1990) The Matrix: Computer Networks and Conferencing Systems Worldwide, 746 p. Digital Press, Bedford, MA.