TY  - BOOK
AU  - Critchley,T.A.
AU  - Batty,K.C.
TI  - Open systems : the reality
SN  - 0130307351
U1  - QA/76.76.O63 
PY  - 1993///
CY  - New York
PB  - Prentice Hall
KW  - Operating systems (Computers).
KW  - OSI (Computer network standard).
N1  - Includes index
ER  -