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  - 001.64 
PY  - 1981///
CY  - New York
PB  - McGraw Hill
KW  - Computer
ER  -