TY  - BOOK
AU  - Zarrella,John
TI  - Operating systems, concepts and principles 
SN  - 0935230009 :
AV  - QA76.6 .Z37
U1  - 001.64 
PY  - 1979///
CY  - Suisun City, Calif.
PB  - Microcomputer Applications
KW  - Operating systems (Computers)
N1  - Includes index; Bibliography: p. 140
ER  -