TY  - BOOK
AU  - Fitzgerald, Jerry
TI  - Business data communications/ 2ed: Basic concept , security and design
U1  - 004.6 
PY  - 1984///
CY  - New York
PB  - John Wiley
KW  - Data transmission systems
KW  -  computer net works
KW  -  Office practice auto mation
ER  -