TY  - BOOK
AU  - George,Darren
AU  - Mallery,Paul
TI  - IBM SPSS Statistics 19 Step by Step: A Simple Guide and Reference 
SN  - 9780205255887
U1  - 005.55 
KW  - Social sciences
N1  - Includes bibliographical references (pages 399-400) and index
ER  -