TY  - BOOK
AU  - Horwitz Geoffrey B.
AU  -  Young Michael Dendy
TI  - Computer operating systems :  Investment or overhea   
T2  - American Management Association, Management Briefing
U1  - X:8:(D6,9(B), L5 
PY  - 1975///
CY  - New York
PB  - American Management Association U. S. A.    
KW  - Management
ER  -