TY  - BOOK
AU  - Black, Uyless 
TI  - Data networks: concepts, theory, and practice
SN  - 0131984667
U1  - 004.6 B5618d 
PY  - 1989///
CY  - New Jersey
PB  - Prentice Hall
KW  - Computer networks
KW  - Data transmission systems
ER  -