TY  - BOOK
AU  - Trevennor,Alan
TI  - Operating systems: a user-friendly guide 
SN  - 0905104668
PY  - 1984///]
CY  - Wilmslow : 
PB  - Sigma Technical, 
KW  - Operating systems (Computers)
N1  - Include index; Includes bibliographical reference (page 154-156) and index
ER  -