TY  - BOOK
AU  - Black,Uyless D.
TI  - Data networks: concepts, theory, and practice 
SN  - 0131984667
PY  - 1989///
CY  - Englewood Cliffs, N.J. : 
PB  - Prentice Hall, 
KW  - Computer networks
KW  - Data transmission systems
N1  - Includes bibliographical references and index
ER  -