TY  - GEN
AU  - Hull, C. Hadlai 
AU  - Nie, Norman H. 
TI  - SPSS update 7-9: new procedures and facilities for releases 7-9
SN  - 0070465428
U1  - 005 
PY  - 1981///
CY  - New York
PB  - McGraw-Hill Book Company
KW  - Computer programming, programs, data
ER  -