TY  - BOOK
AU  - Ayala R. J. de
TI  - Theory and practice of item response theory
T2  - Methodology in the social sciences
SN  - 9781593858698 (hbk)
U1  - Sigma:(B28), P9 
PY  - 2009///
CY  - New York
PB  - Guilford USA      
KW  - SPIRITUALISM
ER  -