Fitzgerald, Jerry.
Business data communications : basic concepts,security, and design,3rd ed. / Jerry fitzgerald. - New York : Wiley, c1990.
0471517836
Data transmission systems.
004.6 FIR
Business data communications : basic concepts,security, and design,3rd ed. / Jerry fitzgerald. - New York : Wiley, c1990.
0471517836
Data transmission systems.
004.6 FIR