TY  - BOOK
AU  - Sin autor
AU  - International Business Machines Corporation - IBM
TI  - IBM System/360 Operating System: Operator's Procedures : OS Release 21
T2  - IBM systems reference library
PY  - 1971///
CY  - Nueva York
PB  - [S.n.]
KW  - OS/360
KW  - IBM SYSTEM/360
ER  -