TY  - BOOK
AU  - Ellzey,Roy S.
TI  - Computer systems software: the programmer/machine interface 
SN  - 057421965X
AV  - QA76.754 .E45 1987
U1  - 005 19
PY  - 1987///
CY  - Chicago
PB  - Science Research Associates
KW  - Systems software
KW  - Computer programming
N1  - includes bibliographical references and index
ER  -