TY  - BOOK
AU  - Shelly,Gary B.
AU  - Serwatka,Judy A.
AU  - Cashman,Thomas J.
TI  - Business data communications: introductory concepts and techniques 
SN  - 0789568063
PY  - 2004///
CY  - Cambridge, Mass., London
PB  - Course Technology
KW  - Data transmission systems
KW  - Computer networks
KW  - sears
N1  - Previous ed.: 2001
ER  -