TY  - BOOK
AU  - Welss, na and hassett ,m.j
TI  - Introductory statistics
SN  - 0 201 17833 8
AV  - QA 276 12 45 1991 
PY  - 1991///
CY  - New york
PB  - Addison wesley pub.comp.
KW  - Statistic
ER  -